Advanced Linux Sound Architecture - Driver ========================================== Configuration guide Kernel Configuration ==================== To enable ALSA support you need at least to build the kernel with primary sound card support (CONFIG_SOUND). Since ALSA can emulate OSS, you don't have to choose any of the OSS modules. Enable "OSS API emulation" (CONFIG_SND_OSSEMUL) and both OSS mixer and PCM supports if you want to run OSS applications with ALSA. If you want to support the WaveTable functionality on cards such as SB Live! then you need to enable "Sequencer support" (CONFIG_SND_SEQUENCER). To make ALSA debug messages more verbose, enable the "Verbose printk" and "Debug" options. To check for memory leaks, turn on "Debug memory" too. "Debug detection" will add checks for the detection of cards. Please note that all the ALSA ISA drivers support the Linux isapnp API (if the card supports ISA PnP). You don't need to configure the cards using isapnptools. Creating ALSA devices ===================== This depends on your distribution, but normally you use the /dev/MAKEDEV script to create the necessary device nodes. On some systems you use a script named 'snddevices'. Module parameters ================= The user can load modules with options. If the module supports more than one card and you have more than one card of the same type then you can specify multiple values for the option separated by commas. Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed. Module snd ---------- The core ALSA module. It is used by all ALSA card drivers. It takes the following options which have global effects. major - major number for sound driver - Default: 116 cards_limit - limiting card index for auto-loading (1-8) - Default: 1 - For auto-loading more than one card, specify this option together with snd-card-X aliases. slots - Reserve the slot index for the given driver. This option takes multiple strings. See "Module Autoloading Support" section for details. Module snd-pcm-oss ------------------ The PCM OSS emulation module. This module takes options which change the mapping of devices. dsp_map - PCM device number maps assigned to the 1st OSS device. - Default: 0 adsp_map - PCM device number maps assigned to the 2st OSS device. - Default: 1 nonblock_open - Don't block opening busy PCM devices. Default: 1 For example, when dsp_map=2, /dev/dsp will be mapped to PCM #2 of the card #0. Similarly, when adsp_map=0, /dev/adsp will be mapped to PCM #0 of the card #0. For changing the second or later card, specify the option with commas, such like "dsp_map=0,1". nonblock_open option is used to change the behavior of the PCM regarding opening the device. When this option is non-zero, opening a busy OSS PCM device won't be blocked but return immediately with EAGAIN (just like O_NONBLOCK flag). Module snd-rawmidi ------------------ This module takes options which change the mapping of devices. similar to those of the snd-pcm-oss module. midi_map - MIDI device number maps assigned to the 1st OSS device. - Default: 0 amidi_map - MIDI device number maps assigned to the 2st OSS device. - Default: 1 Common parameters for top sound card modules -------------------------------------------- Each of top level sound card module takes the following options. index - index (slot #) of sound card - Values: 0 through 31 or negative - If nonnegative, assign that index number - if negative, interpret as a bitmask of permissible indices; the first free permitted index is assigned - Default: -1 id - card ID (identifier or name) - Can be up to 15 characters long - Default: the card type - A directory by this name is created under /proc/asound/ containing information about the card - This ID can be used instead of the index number in identifying the card enable - enable card - Default: enabled, for PCI and ISA PnP cards Module snd-adlib ---------------- Module for AdLib FM cards. port - port # for OPL chip This module supports multiple cards. It does not support autoprobe, so the port must be specified. For actual AdLib FM cards it will be 0x388. Note that this card does not have PCM support and no mixer; only FM synthesis. Make sure you have "sbiload" from the alsa-tools package available and, after loading the module, find out the assigned ALSA sequencer port number through "sbiload -l". Example output: Port Client name Port name 64:0 OPL2 FM synth OPL2 FM Port Load the std.sb and drums.sb patches also supplied by sbiload: sbiload -p 64:0 std.sb drums.sb If you use this driver to drive an OPL3, you can use std.o3 and drums.o3 instead. To have the card produce sound, use aplaymidi from alsa-utils: aplaymidi -p 64:0 foo.mid Module snd-ad1816a ------------------ Module for sound cards based on Analog Devices AD1816A/AD1815 ISA chips. clockfreq - Clock frequency for AD1816A chip (default = 0, 33000Hz) This module supports multiple cards, autoprobe and PnP. Module snd-ad1848 ----------------- Module for sound cards based on AD1848/AD1847/CS4248 ISA chips. port - port # for AD1848 chip irq - IRQ # for AD1848 chip dma1 - DMA # for AD1848 chip (0,1,3) This module supports multiple cards. It does not support autoprobe thus main port must be specified!!! Other ports are optional. The power-management is supported. Module snd-ad1889 ----------------- Module for Analog Devices AD1889 chips. ac97_quirk - AC'97 workaround for strange hardware See the description of intel8x0 module for details. This module supports multiple cards. Module snd-ali5451 ------------------ Module for ALi M5451 PCI chip. pcm_channels - Number of hardware channels assigned for PCM spdif - Support SPDIF I/O - Default: disabled This module supports one chip and autoprobe. The power-management is supported. Module snd-als100 ----------------- Module for sound cards based on Avance Logic ALS100/ALS120 ISA chips. This module supports multiple cards, autoprobe and PnP. The power-management is supported. Module snd-als300 ----------------- Module for Avance Logic ALS300 and ALS300+ This module supports multiple cards. The power-management is supported. Module snd-als4000 ------------------ Module for sound cards based on Avance Logic ALS4000 PCI chip. joystick_port - port # for legacy joystick support. 0 = disabled (default), 1 = auto-detect This module supports multiple cards, autoprobe and PnP. The power-management is supported. Module snd-atiixp ----------------- Module for ATI IXP 150/200/250/400 AC97 controllers. ac97_clock - AC'97 clock (default = 48000) ac97_quirk - AC'97 workaround for strange hardware See "AC97 Quirk Option" section below. ac97_codec - Workaround to specify which AC'97 codec instead of probing. If this works for you file a bug with your `lspci -vn` output. -2 -- Force probing. -1 -- Default behavior. 0-2 -- Use the specified codec. spdif_aclink - S/PDIF transfer over AC-link (default = 1) This module supports one card and autoprobe. ATI IXP has two different methods to control SPDIF output. One is over AC-link and another is over the "direct" SPDIF output. The implementation depends on the motherboard, and you'll need to choose the correct one via spdif_aclink module option. The power-management is supported. Module snd-atiixp-modem ----------------------- Module for ATI IXP 150/200/250 AC97 modem controllers. This module supports one card and autoprobe. Note: The default index value of this module is -2, i.e. the first slot is excluded. The power-management is supported. Module snd-au8810, snd-au8820, snd-au8830 ----------------------------------------- Module for Aureal Vortex, Vortex2 and Advantage device. pcifix - Control PCI workarounds 0 = Disable all workarounds 1 = Force the PCI latency of the Aureal card to 0xff 2 = Force the Extend PCI#2 Internal Master for Efficient Handling of Dummy Requests on the VIA KT133 AGP Bridge 3 = Force both settings 255 = Autodetect what is required (default) This module supports all ADB PCM channels, ac97 mixer, SPDIF, hardware EQ, mpu401, gameport. A3D and wavetable support are still in development. Development and reverse engineering work is being coordinated at http://savannah.nongnu.org/projects/openvortex/ SPDIF output has a copy of the AC97 codec output, unless you use the "spdif" pcm device, which allows raw data passthru. The hardware EQ hardware and SPDIF is only present in the Vortex2 and Advantage. Note: Some ALSA mixer applications don't handle the SPDIF sample rate control correctly. If you have problems regarding this, try another ALSA compliant mixer (alsamixer works). Module snd-aw2 -------------- Module for Audiowerk2 sound card This module supports multiple cards. Module snd-azt2320 ------------------ Module for sound cards based on Aztech System AZT2320 ISA chip (PnP only). This module supports multiple cards, PnP and autoprobe. The power-management is supported. Module snd-azt3328 ------------------ Module for sound cards based on Aztech AZF3328 PCI chip. joystick - Enable joystick (default off) This module supports multiple cards. Module snd-bt87x ---------------- Module for video cards based on Bt87x chips. digital_rate - Override the default digital rate (Hz) load_all - Load the driver even if the card model isn't known This module supports multiple cards. Note: The default index value of this module is -2, i.e. the first slot is excluded. Module snd-ca0106 ----------------- Module for Creative Audigy LS and SB Live 24bit This module supports multiple cards. Module snd-cmi8330 ------------------ Module for sound cards based on C-Media CMI8330 ISA chips. isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: wssport - port # for CMI8330 chip (WSS) wssirq - IRQ # for CMI8330 chip (WSS) wssdma - first DMA # for CMI8330 chip (WSS) sbport - port # for CMI8330 chip (SB16) sbirq - IRQ # for CMI8330 chip (SB16) sbdma8 - 8bit DMA # for CMI8330 chip (SB16) sbdma16 - 16bit DMA # for CMI8330 chip (SB16) This module supports multiple cards and autoprobe. The power-management is supported. Module snd-cmipci ----------------- Module for C-Media CMI8338/8738/8768/8770 PCI sound cards. mpu_port - port address of MIDI interface (8338 only): 0x300,0x310,0x320,0x330 = legacy port, 0 = disable (default) fm_port - port address of OPL-3 FM synthesizer (8x38 only): 0x388 = legacy port, 1 = integrated PCI port (default on 8738), 0 = disable soft_ac3 - Software-conversion of raw SPDIF packets (model 033 only) (default = 1) joystick_port - Joystick port address (0 = disable, 1 = auto-detect) This module supports autoprobe and multiple cards. The power-management is supported. Module snd-cs4231 ----------------- Module for sound cards based on CS4231 ISA chips. port - port # for CS4231 chip mpu_port - port # for MPU-401 UART (optional), -1 = disable irq - IRQ # for CS4231 chip mpu_irq - IRQ # for MPU-401 UART dma1 - first DMA # for CS4231 chip dma2 - second DMA # for CS4231 chip This module supports multiple cards. This module does not support autoprobe thus main port must be specified!!! Other ports are optional. The power-management is supported. Module snd-cs4232 ----------------- Module for sound cards based on CS4232/CS4232A ISA chips. isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for CS4232 chip (PnP setup - 0x534) cport - control port # for CS4232 chip (PnP setup - 0x120,0x210,0xf00) mpu_port - port # for MPU-401 UART (PnP setup - 0x300), -1 = disable fm_port - FM port # for CS4232 chip (PnP setup - 0x388), -1 = disable irq - IRQ # for CS4232 chip (5,7,9,11,12,15) mpu_irq - IRQ # for MPU-401 UART (9,11,12,15) dma1 - first DMA # for CS4232 chip (0,1,3) dma2 - second DMA # for Yamaha CS4232 chip (0,1,3), -1 = disable This module supports multiple cards. This module does not support autoprobe (if ISA PnP is not used) thus main port must be specified!!! Other ports are optional. The power-management is supported. Module snd-cs4236 ----------------- Module for sound cards based on CS4235/CS4236/CS4236B/CS4237B/ CS4238B/CS4239 ISA chips. isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for CS4236 chip (PnP setup - 0x534) cport - control port # for CS4236 chip (PnP setup - 0x120,0x210,0xf00) mpu_port - port # for MPU-401 UART (PnP setup - 0x300), -1 = disable fm_port - FM port # for CS4236 chip (PnP setup - 0x388), -1 = disable irq - IRQ # for CS4236 chip (5,7,9,11,12,15) mpu_irq - IRQ # for MPU-401 UART (9,11,12,15) dma1 - first DMA # for CS4236 chip (0,1,3) dma2 - second DMA # for CS4236 chip (0,1,3), -1 = disable This module supports multiple cards. This module does not support autoprobe (if ISA PnP is not used) thus main port and control port must be specified!!! Other ports are optional. The power-management is supported. Module snd-cs4281 ----------------- Module for Cirrus Logic CS4281 soundchip. dual_codec - Secondary codec ID (0 = disable, default) This module supports multiple cards. The power-management is supported. Module snd-cs46xx ----------------- Module for PCI sound cards based on CS4610/CS4612/CS4614/CS4615/CS4622/ CS4624/CS4630/CS4280 PCI chips. external_amp - Force to enable external amplifier. thinkpad - Force to enable Thinkpad's CLKRUN control. mmap_valid - Support OSS mmap mode (default = 0). This module supports multiple cards and autoprobe. Usually external amp and CLKRUN controls are detected automatically from PCI sub vendor/device ids. If they don't work, give the options above explicitly. The power-management is supported. Module snd-cs5530 _________________ Module for Cyrix/NatSemi Geode 5530 chip. Module snd-cs5535audio ---------------------- Module for multifunction CS5535 companion PCI device The power-management is supported. Module snd-darla20 ------------------ Module for Echoaudio Darla20 This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-darla24 ------------------ Module for Echoaudio Darla24 This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-dt019x ----------------- Module for Diamond Technologies DT-019X / Avance Logic ALS-007 (PnP only) This module supports multiple cards. This module is enabled only with ISA PnP support. The power-management is supported. Module snd-dummy ---------------- Module for the dummy sound card. This "card" doesn't do any output or input, but you may use this module for any application which requires a sound card (like RealPlayer). The power-management is supported. Module snd-echo3g ----------------- Module for Echoaudio 3G cards (Gina3G/Layla3G) This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-emu10k1 ------------------ Module for EMU10K1/EMU10k2 based PCI sound cards. * Sound Blaster Live! * Sound Blaster PCI 512 * Emu APS (partially supported) * Sound Blaster Audigy extin - bitmap of available external inputs for FX8010 (see bellow) extout - bitmap of available external outputs for FX8010 (see bellow) seq_ports - allocated sequencer ports (4 by default) max_synth_voices - limit of voices used for wavetable (64 by default) max_buffer_size - specifies the maximum size of wavetable/pcm buffers given in MB unit. Default value is 128. enable_ir - enable IR This module supports multiple cards and autoprobe. Input & Output configurations [extin/extout] * Creative Card wo/Digital out [0x0003/0x1f03] * Creative Card w/Digital out [0x0003/0x1f0f] * Creative Card w/Digital CD in [0x000f/0x1f0f] * Creative Card wo/Digital out + LiveDrive [0x3fc3/0x1fc3] * Creative Card w/Digital out + LiveDrive [0x3fc3/0x1fcf] * Creative Card w/Digital CD in + LiveDrive [0x3fcf/0x1fcf] * Creative Card wo/Digital out + Digital I/O 2 [0x0fc3/0x1f0f] * Creative Card w/Digital out + Digital I/O 2 [0x0fc3/0x1f0f] * Creative Card w/Digital CD in + Digital I/O 2 [0x0fcf/0x1f0f] * Creative Card 5.1/w Digital out + LiveDrive [0x3fc3/0x1fff] * Creative Card 5.1 (c) 2003 [0x3fc3/0x7cff] * Creative Card all ins and outs [0x3fff/0x7fff] The power-management is supported. Module snd-emu10k1x ------------------- Module for Creative Emu10k1X (SB Live Dell OEM version) This module supports multiple cards. Module snd-ens1370 ------------------ Module for Ensoniq AudioPCI ES1370 PCI sound cards. * SoundBlaster PCI 64 * SoundBlaster PCI 128 joystick - Enable joystick (default off) This module supports multiple cards and autoprobe. The power-management is supported. Module snd-ens1371 ------------------ Module for Ensoniq AudioPCI ES1371 PCI sound cards. * SoundBlaster PCI 64 * SoundBlaster PCI 128 * SoundBlaster Vibra PCI joystick_port - port # for joystick (0x200,0x208,0x210,0x218), 0 = disable (default), 1 = auto-detect This module supports multiple cards and autoprobe. The power-management is supported. Module snd-es968 ---------------- Module for sound cards based on ESS ES968 chip (PnP only). This module supports multiple cards, PnP and autoprobe. The power-management is supported. Module snd-es1688 ----------------- Module for ESS AudioDrive ES-1688 and ES-688 sound cards. port - port # for ES-1688 chip (0x220,0x240,0x260) mpu_port - port # for MPU-401 port (0x300,0x310,0x320,0x330), -1 = disable (default) irq - IRQ # for ES-1688 chip (5,7,9,10) mpu_irq - IRQ # for MPU-401 port (5,7,9,10) dma8 - DMA # for ES-1688 chip (0,1,3) This module supports multiple cards and autoprobe (without MPU-401 port). Module snd-es18xx ----------------- Module for ESS AudioDrive ES-18xx sound cards. isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for ES-18xx chip (0x220,0x240,0x260) mpu_port - port # for MPU-401 port (0x300,0x310,0x320,0x330), -1 = disable (default) fm_port - port # for FM (optional, not used) irq - IRQ # for ES-18xx chip (5,7,9,10) dma1 - first DMA # for ES-18xx chip (0,1,3) dma2 - first DMA # for ES-18xx chip (0,1,3) This module supports multiple cards, ISA PnP and autoprobe (without MPU-401 port if native ISA PnP routines are not used). When dma2 is equal with dma1, the driver works as half-duplex. The power-management is supported. Module snd-es1938 ----------------- Module for sound cards based on ESS Solo-1 (ES1938,ES1946) chips. This module supports multiple cards and autoprobe. The power-management is supported. Module snd-es1968 ----------------- Module for sound cards based on ESS Maestro-1/2/2E (ES1968/ES1978) chips. total_bufsize - total buffer size in kB (1-4096kB) pcm_substreams_p - playback channels (1-8, default=2) pcm_substreams_c - capture channels (1-8, default=0) clock - clock (0 = auto-detection) use_pm - support the power-management (0 = off, 1 = on, 2 = auto (default)) enable_mpu - enable MPU401 (0 = off, 1 = on, 2 = auto (default)) joystick - enable joystick (default off) This module supports multiple cards and autoprobe. The power-management is supported. Module snd-fm801 ---------------- Module for ForteMedia FM801 based PCI sound cards. tea575x_tuner - Enable TEA575x tuner - 1 = MediaForte 256-PCS - 2 = MediaForte 256-PCPR - 3 = MediaForte 64-PCR - High 16-bits are video (radio) device number + 1 - example: 0x10002 (MediaForte 256-PCPR, device 1) This module supports multiple cards and autoprobe. The power-management is supported. Module snd-gina20 ----------------- Module for Echoaudio Gina20 This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-gina24 ----------------- Module for Echoaudio Gina24 This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-gusclassic --------------------- Module for Gravis UltraSound Classic sound card. port - port # for GF1 chip (0x220,0x230,0x240,0x250,0x260) irq - IRQ # for GF1 chip (3,5,9,11,12,15) dma1 - DMA # for GF1 chip (1,3,5,6,7) dma2 - DMA # for GF1 chip (1,3,5,6,7,-1=disable) joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V) voices - GF1 voices limit (14-32) pcm_voices - reserved PCM voices This module supports multiple cards and autoprobe. Module snd-gusextreme --------------------- Module for Gravis UltraSound Extreme (Synergy ViperMax) sound card. port - port # for ES-1688 chip (0x220,0x230,0x240,0x250,0x260) gf1_port - port # for GF1 chip (0x210,0x220,0x230,0x240,0x250,0x260,0x270) mpu_port - port # for MPU-401 port (0x300,0x310,0x320,0x330), -1 = disable irq - IRQ # for ES-1688 chip (5,7,9,10) gf1_irq - IRQ # for GF1 chip (3,5,9,11,12,15) mpu_irq - IRQ # for MPU-401 port (5,7,9,10) dma8 - DMA # for ES-1688 chip (0,1,3) dma1 - DMA # for GF1 chip (1,3,5,6,7) joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V) voices - GF1 voices limit (14-32) pcm_voices - reserved PCM voices This module supports multiple cards and autoprobe (without MPU-401 port). Module snd-gusmax ----------------- Module for Gravis UltraSound MAX sound card. port - port # for GF1 chip (0x220,0x230,0x240,0x250,0x260) irq - IRQ # for GF1 chip (3,5,9,11,12,15) dma1 - DMA # for GF1 chip (1,3,5,6,7) dma2 - DMA # for GF1 chip (1,3,5,6,7,-1=disable) joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V) voices - GF1 voices limit (14-32) pcm_voices - reserved PCM voices This module supports multiple cards and autoprobe. Module snd-hda-intel -------------------- Module for Intel HD Audio (ICH6, ICH6M, ESB2, ICH7, ICH8, ICH9, ICH10, PCH, SCH), ATI SB450, SB600, R600, RS600, RS690, RS780, RV610, RV620, RV630, RV635, RV670, RV770, VIA VT8251/VT8237A, SIS966, ULI M5461 [Multiple options for each card instance] model - force the model name position_fix - Fix DMA pointer (0 = auto, 1 = use LPIB, 2 = POSBUF) probe_mask - Bitmask to probe codecs (default = -1, meaning all slots) bdl_pos_adj - Specifies the DMA IRQ timing delay in samples. Passing -1 will make the driver to choose the appropriate value based on the controller chip. [Single (global) options] single_cmd - Use single immediate commands to communicate with codecs (for debugging only) enable_msi - Enable Message Signaled Interrupt (MSI) (default = off) power_save - Automatic power-saving timtout (in second, 0 = disable) power_save_controller - Reset HD-audio controller in power-saving mode (default = on) This module supports multiple cards and autoprobe. Each codec may have a model table for different configurations. If your machine isn't listed there, the default (usually minimal) configuration is set up. You can pass "model=" option to specify a certain model in such a case. There are different models depending on the codec chip. Model name Description ---------- ----------- ALC880 3stack 3-jack in back and a headphone out 3stack-digout 3-jack in back, a HP out and a SPDIF out 5stack 5-jack in back, 2-jack in front 5stack-digout 5-jack in back, 2-jack in front, a SPDIF out 6stack 6-jack in back, 2-jack in front 6stack-digout 6-jack with a SPDIF out w810 3-jack z71v 3-jack (HP shared SPDIF) asus 3-jack (ASUS Mobo) asus-w1v ASUS W1V asus-dig ASUS with SPDIF out asus-dig2 ASUS with SPDIF out (using GPIO2) uniwill 3-jack fujitsu Fujitsu Laptops (Pi1536) F1734 2-jack lg LG laptop (m1 express dual) lg-lw LG LW20/LW25 laptop tcl TCL S700 clevo Clevo laptops (m520G, m665n) medion Medion Rim 2150 test for testing/debugging purpose, almost all controls can be adjusted. Appearing only when compiled with $CONFIG_SND_DEBUG=y auto auto-config reading BIOS (default) ALC260 hp HP machines hp-3013 HP machines (3013-variant) hp-dc7600 HP DC7600 fujitsu Fujitsu S7020 acer Acer TravelMate will Will laptops (PB V7900) replacer Replacer 672V basic fixed pin assignment (old default model) test for testing/debugging purpose, almost all controls can adjusted. Appearing only when compiled with $CONFIG_SND_DEBUG=y auto auto-config reading BIOS (default) ALC262 fujitsu Fujitsu Laptop hp-bpc HP xw4400/6400/8400/9400 laptops hp-bpc-d7000 HP BPC D7000 hp-tc-t5735 HP Thin Client T5735 hp-rp5700 HP RP5700 benq Benq ED8 benq-t31 Benq T31 hippo Hippo (ATI) with jack detection, Sony UX-90s hippo_1 Hippo (Benq) with jack detection sony-assamd Sony ASSAMD toshiba-s06 Toshiba S06 toshiba-rx1 Toshiba RX1 ultra Samsung Q1 Ultra Vista model lenovo-3000 Lenovo 3000 y410 nec NEC Versa S9100 basic fixed pin assignment w/o SPDIF auto auto-config reading BIOS (default) ALC267/268 quanta-il1 Quanta IL1 mini-notebook 3stack 3-stack model toshiba Toshiba A205 acer Acer laptops acer-aspire Acer Aspire One dell Dell OEM laptops (Vostro 1200) zepto Zepto laptops test for testing/debugging purpose, almost all controls can adjusted. Appearing only when compiled with $CONFIG_SND_DEBUG=y auto auto-config reading BIOS (default) ALC269 basic Basic preset quanta Quanta FL1 eeepc-p703 ASUS Eeepc P703 P900A eeepc-p901 ASUS Eeepc P901 S101 ALC662/663 3stack-dig 3-stack (2-channel) with SPDIF 3stack-6ch 3-stack (6-channel) 3stack-6ch-dig 3-stack (6-channel) with SPDIF 6stack-dig 6-stack with SPDIF lenovo-101e Lenovo laptop eeepc-p701 ASUS Eeepc P701 eeepc-ep20 ASUS Eeepc EP20 ecs ECS/Foxconn mobo m51va ASUS M51VA g71v ASUS G71V h13 ASUS H13 g50v ASUS G50V asus-mode1 ASUS asus-mode2 ASUS asus-mode3 ASUS asus-mode4 ASUS asus-mode5 ASUS asus-mode6 ASUS auto auto-config reading BIOS (default) ALC882/885 3stack-dig 3-jack with SPDIF I/O 6stack-dig 6-jack digital with SPDIF I/O arima Arima W820Di1 targa Targa T8, MSI-1049 T8 asus-a7j ASUS A7J asus-a7m ASUS A7M macpro MacPro support mbp3 Macbook Pro rev3 imac24 iMac 24'' with jack detection w2jc ASUS W2JC auto auto-config reading BIOS (default) ALC883/888 3stack-dig 3-jack with SPDIF I/O 6stack-dig 6-jack digital with SPDIF I/O 3stack-6ch 3-jack 6-channel 3stack-6ch-dig 3-jack 6-channel with SPDIF I/O 6stack-dig-demo 6-jack digital for Intel demo board acer Acer laptops (Travelmate 3012WTMi, Aspire 5600, etc) acer-aspire Acer Aspire 9810 medion Medion Laptops medion-md2 Medion MD2 targa-dig Targa/MSI targa-2ch-dig Targs/MSI with 2-channel laptop-eapd 3-jack with SPDIF I/O and EAPD (Clevo M540JE, M550JE) lenovo-101e Lenovo 101E lenovo-nb0763 Lenovo NB0763 lenovo-ms7195-dig Lenovo MS7195 lenovo-sky Lenovo Sky haier-w66 Haier W66 3stack-hp HP machines with 3stack (Lucknow, Samba boards) 6stack-dell Dell machines with 6stack (Inspiron 530) mitac Mitac 8252D clevo-m720 Clevo M720 laptop series fujitsu-pi2515 Fujitsu AMILO Pi2515 3stack-6ch-intel Intel DG33* boards auto auto-config reading BIOS (default) ALC861/660 3stack 3-jack 3stack-dig 3-jack with SPDIF I/O 6stack-dig 6-jack with SPDIF I/O 3stack-660 3-jack (for ALC660) uniwill-m31 Uniwill M31 laptop toshiba Toshiba laptop support asus Asus laptop support asus-laptop ASUS F2/F3 laptops auto auto-config reading BIOS (default) ALC861VD/660VD 3stack 3-jack 3stack-dig 3-jack with SPDIF OUT 6stack-dig 6-jack with SPDIF OUT 3stack-660 3-jack (for ALC660VD) 3stack-660-digout 3-jack with SPDIF OUT (for ALC660VD) lenovo Lenovo 3000 C200 dallas Dallas laptops hp HP TX1000 auto auto-config reading BIOS (default) CMI9880 minimal 3-jack in back min_fp 3-jack in back, 2-jack in front full 6-jack in back, 2-jack in front full_dig 6-jack in back, 2-jack in front, SPDIF I/O allout 5-jack in back, 2-jack in front, SPDIF out auto auto-config reading BIOS (default) AD1882 / AD1882A 3stack 3-stack mode (default) 6stack 6-stack mode AD1884A / AD1883 / AD1984A / AD1984B desktop 3-stack desktop (default) laptop laptop with HP jack sensing mobile mobile devices with HP jack sensing thinkpad Lenovo Thinkpad X300 AD1884 N/A AD1981 basic 3-jack (default) hp HP nx6320 thinkpad Lenovo Thinkpad T60/X60/Z60 toshiba Toshiba U205 AD1983 N/A AD1984 basic default configuration thinkpad Lenovo Thinkpad T61/X61 dell Dell T3400 AD1986A 6stack 6-jack, separate surrounds (default) 3stack 3-stack, shared surrounds laptop 2-channel only (FSC V2060, Samsung M50) laptop-eapd 2-channel with EAPD (ASUS A6J) laptop-automute 2-channel with EAPD and HP-automute (Lenovo N100) ultra 2-channel with EAPD (Samsung Ultra tablet PC) samsung 2-channel with EAPD (Samsung R65) AD1988/AD1988B/AD1989A/AD1989B 6stack 6-jack 6stack-dig ditto with SPDIF 3stack 3-jack 3stack-dig ditto with SPDIF laptop 3-jack with hp-jack automute laptop-dig ditto with SPDIF auto auto-config reading BIOS (default) Conexant 5045 laptop-hpsense Laptop with HP sense (old model laptop) laptop-micsense Laptop with Mic sense (old model fujitsu) laptop-hpmicsense Laptop with HP and Mic senses benq Benq R55E test for testing/debugging purpose, almost all controls can be adjusted. Appearing only when compiled with $CONFIG_SND_DEBUG=y Conexant 5047 laptop Basic Laptop config laptop-hp Laptop config for some HP models (subdevice 30A5) laptop-eapd Laptop config with EAPD support test for testing/debugging purpose, almost all controls can be adjusted. Appearing only when compiled with $CONFIG_SND_DEBUG=y Conexant 5051 laptop Basic Laptop config (default) hp HP Spartan laptop STAC9200 ref Reference board dell-d21 Dell (unknown) dell-d22 Dell (unknown) dell-d23 Dell (unknown) dell-m21 Dell Inspiron 630m, Dell Inspiron 640m dell-m22 Dell Latitude D620, Dell Latitude D820 dell-m23 Dell XPS M1710, Dell Precision M90 dell-m24 Dell Latitude 120L dell-m25 Dell Inspiron E1505n dell-m26 Dell Inspiron 1501 dell-m27 Dell Inspiron E1705/9400 gateway Gateway laptops with EAPD control panasonic Panasonic CF-74 STAC9205/9254 ref Reference board dell-m42 Dell (unknown) dell-m43 Dell Precision dell-m44 Dell Inspiron STAC9220/9221 ref Reference board 3stack D945 3stack 5stack D945 5stack + SPDIF intel-mac-v1 Intel Mac Type 1 intel-mac-v2 Intel Mac Type 2 intel-mac-v3 Intel Mac Type 3 intel-mac-v4 Intel Mac Type 4 intel-mac-v5 Intel Mac Type 5 intel-mac-auto Intel Mac (detect type according to subsystem id) macmini Intel Mac Mini (equivalent with type 3) macbook Intel Mac Book (eq. type 5) macbook-pro-v1 Intel Mac Book Pro 1st generation (eq. type 3) macbook-pro Intel Mac Book Pro 2nd generation (eq. type 3) imac-intel Intel iMac (eq. type 2) imac-intel-20 Intel iMac (newer version) (eq. type 3) dell-d81 Dell (unknown) dell-d82 Dell (unknown) dell-m81 Dell (unknown) dell-m82 Dell XPS M1210 STAC9202/9250/9251 ref Reference board, base config m2-2 Some Gateway MX series laptops m6 Some Gateway NX series laptops pa6 Gateway NX860 series STAC9227/9228/9229/927x ref Reference board ref-no-jd Reference board without HP/Mic jack detection 3stack D965 3stack 5stack D965 5stack + SPDIF dell-3stack Dell Dimension E520 dell-bios Fixes with Dell BIOS setup STAC92HD71B* ref Reference board dell-m4-1 Dell desktops dell-m4-2 Dell desktops dell-m4-3 Dell desktops STAC92HD73* ref Reference board no-jd BIOS setup but without jack-detection dell-m6-amic Dell desktops/laptops with analog mics dell-m6-dmic Dell desktops/laptops with digital mics dell-m6 Dell desktops/laptops with both type of mics STAC9872 vaio Setup for VAIO FE550G/SZ110 vaio-ar Setup for VAIO AR The model name "genric" is treated as a special case. When this model is given, the driver uses the generic codec parser without "codec-patch". It's sometimes good for testing and debugging. If the default configuration doesn't work and one of the above matches with your device, report it together with the PCI subsystem ID (output of "lspci -nv") to ALSA BTS or alsa-devel ML (see the section "Links and Addresses"). power_save and power_save_controller options are for power-saving mode. See powersave.txt for details. Note 2: If you get click noises on output, try the module option position_fix=1 or 2. position_fix=1 will use the SD_LPIB register value without FIFO size correction as the current DMA pointer. position_fix=2 will make the driver to use the position buffer instead of reading SD_LPIB register. (Usually SD_LPIB register is more accurate than the position buffer.) NB: If you get many "azx_get_response timeout" messages at loading, it's likely a problem of interrupts (e.g. ACPI irq routing). Try to boot with options like "pci=noacpi". Also, you can try "single_cmd=1" module option. This will switch the communication method between HDA controller and codecs to the single immediate commands instead of CORB/RIRB. Basically, the single command mode is provided only for BIOS, and you won't get unsolicited events, too. But, at least, this works independently from the irq. Remember this is a last resort, and should be avoided as much as possible... MORE NOTES ON "azx_get_response timeout" PROBLEMS: On some hardwares, you may need to add a proper probe_mask option to avoid the "azx_get_response timeout" problem above, instead. This occurs when the access to non-existing or non-working codec slot (likely a modem one) causes a stall of the communication via HD-audio bus. You can see which codec slots are probed by enabling CONFIG_SND_DEBUG_VERBOSE, or simply from the file name of the codec proc files. Then limit the slots to probe by probe_mask option. For example, probe_mask=1 means to probe only the first slot, and probe_mask=4 means only the third slot. The power-management is supported. Module snd-hdsp --------------- Module for RME Hammerfall DSP audio interface(s) This module supports multiple cards. Note: The firmware data can be automatically loaded via hotplug when CONFIG_FW_LOADER is set. Otherwise, you need to load the firmware via hdsploader utility included in alsa-tools package. The firmware data is found in alsa-firmware package. Note: snd-page-alloc module does the job which snd-hammerfall-mem module did formerly. It will allocate the buffers in advance when any HDSP cards are found. To make the buffer allocation sure, load snd-page-alloc module in the early stage of boot sequence. See "Early Buffer Allocation" section. Module snd-hdspm ---------------- Module for RME HDSP MADI board. precise_ptr - Enable precise pointer, or disable. line_outs_monitor - Send playback streams to analog outs by default. enable_monitor - Enable Analog Out on Channel 63/64 by default. See hdspm.txt for details. Module snd-hifier ----------------- Module for the MediaTek/TempoTec HiFier Fantasia sound card. This module supports autoprobe and multiple cards. Module snd-ice1712 ------------------ Module for Envy24 (ICE1712) based PCI sound cards. * MidiMan M Audio Delta 1010 * MidiMan M Audio Delta 1010LT * MidiMan M Audio Delta DiO 2496 * MidiMan M Audio Delta 66 * MidiMan M Audio Delta 44 * MidiMan M Audio Delta 410 * MidiMan M Audio Audiophile 2496 * TerraTec EWS 88MT * TerraTec EWS 88D * TerraTec EWX 24/96 * TerraTec DMX 6Fire * TerraTec Phase 88 * Hoontech SoundTrack DSP 24 * Hoontech SoundTrack DSP 24 Value * Hoontech SoundTrack DSP 24 Media 7.1 * Event Electronics, EZ8 * Digigram VX442 * Lionstracs, Mediastaton * Terrasoniq TS 88 model - Use the given board model, one of the following: delta1010, dio2496, delta66, delta44, audiophile, delta410, delta1010lt, vx442, ewx2496, ews88mt, ews88mt_new, ews88d, dmx6fire, dsp24, dsp24_value, dsp24_71, ez8, phase88, mediastation omni - Omni I/O support for MidiMan M-Audio Delta44/66 cs8427_timeout - reset timeout for the CS8427 chip (S/PDIF transceiver) in msec resolution, default value is 500 (0.5 sec) This module supports multiple cards and autoprobe. Note: The consumer part is not used with all Envy24 based cards (for example in the MidiMan Delta serie). Note: The supported board is detected by reading EEPROM or PCI SSID (if EEPROM isn't available). You can override the model by passing "model" module option in case that the driver isn't configured properly or you want to try another type for testing. Module snd-ice1724 ------------------ Module for Envy24HT (VT/ICE1724), Envy24PT (VT1720) based PCI sound cards. * MidiMan M Audio Revolution 5.1 * MidiMan M Audio Revolution 7.1 * MidiMan M Audio Audiophile 192 * AMP Ltd AUDIO2000 * TerraTec Aureon 5.1 Sky * TerraTec Aureon 7.1 Space * TerraTec Aureon 7.1 Universe * TerraTec Phase 22 * TerraTec Phase 28 * AudioTrak Prodigy 7.1 * AudioTrak Prodigy 7.1 LT * AudioTrak Prodigy 7.1 XT * AudioTrak Prodigy 7.1 HIFI * AudioTrak Prodigy 7.1 HD2 * AudioTrak Prodigy 192 * Pontis MS300 * Albatron K8X800 Pro II * Chaintech ZNF3-150 * Chaintech ZNF3-250 * Chaintech 9CJS * Chaintech AV-710 * Shuttle SN25P * Onkyo SE-90PCI * Onkyo SE-200PCI * ESI Juli@ * Hercules Fortissimo IV * EGO-SYS WaveTerminal 192M model - Use the given board model, one of the following: revo51, revo71, amp2000, prodigy71, prodigy71lt, prodigy71xt, prodigy71hifi, prodigyhd2, prodigy192, juli, aureon51, aureon71, universe, ap192, k8x800, phase22, phase28, ms300, av710, se200pci, se90pci, fortissimo4, sn25p, WT192M This module supports multiple cards and autoprobe. Note: The supported board is detected by reading EEPROM or PCI SSID (if EEPROM isn't available). You can override the model by passing "model" module option in case that the driver isn't configured properly or you want to try another type for testing. Module snd-indigo ----------------- Module for Echoaudio Indigo This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-indigodj ------------------- Module for Echoaudio Indigo DJ This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-indigoio ------------------- Module for Echoaudio Indigo IO This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-intel8x0 ------------------- Module for AC'97 motherboards from Intel and compatibles. * Intel i810/810E, i815, i820, i830, i84x, MX440 ICH5, ICH6, ICH7, 6300ESB, ESB2 * SiS 7012 (SiS 735) * NVidia NForce, NForce2, NForce3, MCP04, CK804 CK8, CK8S, MCP501 * AMD AMD768, AMD8111 * ALi m5455 ac97_clock - AC'97 codec clock base (0 = auto-detect) ac97_quirk - AC'97 workaround for strange hardware See "AC97 Quirk Option" section below. buggy_irq - Enable workaround for buggy interrupts on some motherboards (default yes on nForce chips, otherwise off) buggy_semaphore - Enable workaround for hardwares with buggy semaphores (e.g. on some ASUS laptops) (default off) spdif_aclink - Use S/PDIF over AC-link instead of direct connection from the controller chip (0 = off, 1 = on, -1 = default) This module supports one chip and autoprobe. Note: the latest driver supports auto-detection of chip clock. if you still encounter too fast playback, specify the clock explicitly via the module option "ac97_clock=41194". Joystick/MIDI ports are not supported by this driver. If your motherboard has these devices, use the ns558 or snd-mpu401 modules, respectively. The power-management is supported. Module snd-intel8x0m -------------------- Module for Intel ICH (i8x0) chipset MC97 modems. * Intel i810/810E, i815, i820, i830, i84x, MX440 ICH5, ICH6, ICH7 * SiS 7013 (SiS 735) * NVidia NForce, NForce2, NForce2s, NForce3 * AMD AMD8111 * ALi m5455 ac97_clock - AC'97 codec clock base (0 = auto-detect) This module supports one card and autoprobe. Note: The default index value of this module is -2, i.e. the first slot is excluded. The power-management is supported. Module snd-interwave -------------------- Module for Gravis UltraSound PnP, Dynasonic 3-D/Pro, STB Sound Rage 32 and other sound cards based on AMD InterWave (tm) chip. joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V) midi - 1 = MIDI UART enable, 0 = MIDI UART disable (default) pcm_voices - reserved PCM voices for the synthesizer (default 2) effect - 1 = InterWave effects enable (default 0); requires 8 voices isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for InterWave chip (0x210,0x220,0x230,0x240,0x250,0x260) irq - IRQ # for InterWave chip (3,5,9,11,12,15) dma1 - DMA # for InterWave chip (0,1,3,5,6,7) dma2 - DMA # for InterWave chip (0,1,3,5,6,7,-1=disable) This module supports multiple cards, autoprobe and ISA PnP. Module snd-interwave-stb ------------------------ Module for UltraSound 32-Pro (sound card from STB used by Compaq) and other sound cards based on AMD InterWave (tm) chip with TEA6330T circuit for extended control of bass, treble and master volume. joystick_dac - 0 to 31, (0.59V-4.52V or 0.389V-2.98V) midi - 1 = MIDI UART enable, 0 = MIDI UART disable (default) pcm_voices - reserved PCM voices for the synthesizer (default 2) effect - 1 = InterWave effects enable (default 0); requires 8 voices isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for InterWave chip (0x210,0x220,0x230,0x240,0x250,0x260) port_tc - tone control (i2c bus) port # for TEA6330T chip (0x350,0x360,0x370,0x380) irq - IRQ # for InterWave chip (3,5,9,11,12,15) dma1 - DMA # for InterWave chip (0,1,3,5,6,7) dma2 - DMA # for InterWave chip (0,1,3,5,6,7,-1=disable) This module supports multiple cards, autoprobe and ISA PnP. Module snd-korg1212 ------------------- Module for Korg 1212 IO PCI card This module supports multiple cards. Module snd-layla20 ------------------ Module for Echoaudio Layla20 This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-layla24 ------------------ Module for Echoaudio Layla24 This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-maestro3 ------------------- Module for Allegro/Maestro3 chips external_amp - enable external amp (enabled by default) amp_gpio - GPIO pin number for external amp (0-15) or -1 for default pin (8 for allegro, 1 for others) This module supports autoprobe and multiple chips. Note: the binding of amplifier is dependent on hardware. If there is no sound even though all channels are unmuted, try to specify other gpio connection via amp_gpio option. For example, a Panasonic notebook might need "amp_gpio=0x0d" option. The power-management is supported. Module snd-mia --------------- Module for Echoaudio Mia This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-miro --------------- Module for Miro soundcards: miroSOUND PCM 1 pro, miroSOUND PCM 12, miroSOUND PCM 20 Radio. port - Port # (0x530,0x604,0xe80,0xf40) irq - IRQ # (5,7,9,10,11) dma1 - 1st dma # (0,1,3) dma2 - 2nd dma # (0,1) mpu_port - MPU-401 port # (0x300,0x310,0x320,0x330) mpu_irq - MPU-401 irq # (5,7,9,10) fm_port - FM Port # (0x388) wss - enable WSS mode ide - enable onboard ide support Module snd-mixart ----------------- Module for Digigram miXart8 sound cards. This module supports multiple cards. Note: One miXart8 board will be represented as 4 alsa cards. See MIXART.txt for details. When the driver is compiled as a module and the hotplug firmware is supported, the firmware data is loaded via hotplug automatically. Install the necessary firmware files in alsa-firmware package. When no hotplug fw loader is available, you need to load the firmware via mixartloader utility in alsa-tools package. Module snd-mona --------------- Module for Echoaudio Mona This module supports multiple cards. The driver requires the firmware loader support on kernel. Module snd-mpu401 ----------------- Module for MPU-401 UART devices. port - port number or -1 (disable) irq - IRQ number or -1 (disable) pnp - PnP detection - 0 = disable, 1 = enable (default) This module supports multiple devices and PnP. Module snd-mtpav ---------------- Module for MOTU MidiTimePiece AV multiport MIDI (on the parallel port). port - I/O port # for MTPAV (0x378,0x278, default=0x378) irq - IRQ # for MTPAV (7,5, default=7) hwports - number of supported hardware ports, default=8. Module supports only 1 card. This module has no enable option. Module snd-mts64 ---------------- Module for Ego Systems (ESI) Miditerminal 4140 This module supports multiple devices. Requires parport (CONFIG_PARPORT). Module snd-nm256 ---------------- Module for NeoMagic NM256AV/ZX chips playback_bufsize - max playback frame size in kB (4-128kB) capture_bufsize - max capture frame size in kB (4-128kB) force_ac97 - 0 or 1 (disabled by default) buffer_top - specify buffer top address use_cache - 0 or 1 (disabled by default) vaio_hack - alias buffer_top=0x25a800 reset_workaround - enable AC97 RESET workaround for some laptops reset_workaround2 - enable extended AC97 RESET workaround for some other laptops This module supports one chip and autoprobe. The power-management is supported. Note: on some notebooks the buffer address cannot be detected automatically, or causes hang-up during initialization. In such a case, specify the buffer top address explicitly via the buffer_top option. For example, Sony F250: buffer_top=0x25a800 Sony F270: buffer_top=0x272800 The driver supports only ac97 codec. It's possible to force to initialize/use ac97 although it's not detected. In such a case, use force_ac97=1 option - but *NO* guarantee whether it works! Note: The NM256 chip can be linked internally with non-AC97 codecs. This driver supports only the AC97 codec, and won't work with machines with other (most likely CS423x or OPL3SAx) chips, even though the device is detected in lspci. In such a case, try other drivers, e.g. snd-cs4232 or snd-opl3sa2. Some has ISA-PnP but some doesn't have ISA PnP. You'll need to specify isapnp=0 and proper hardware parameters in the case without ISA PnP. Note: some laptops need a workaround for AC97 RESET. For the known hardware like Dell Latitude LS and Sony PCG-F305, this workaround is enabled automatically. For other laptops with a hard freeze, you can try reset_workaround=1 option. Note: Dell Latitude CSx laptops have another problem regarding AC97 RESET. On these laptops, reset_workaround2 option is turned on as default. This option is worth to try if the previous reset_workaround option doesn't help. Note: This driver is really crappy. It's a porting from the OSS driver, which is a result of black-magic reverse engineering. The detection of codec will fail if the driver is loaded *after* X-server as described above. You might be able to force to load the module, but it may result in hang-up. Hence, make sure that you load this module *before* X if you encounter this kind of problem. Module snd-opl3sa2 ------------------ Module for Yamaha OPL3-SA2/SA3 sound cards. isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - control port # for OPL3-SA chip (0x370) sb_port - SB port # for OPL3-SA chip (0x220,0x240) wss_port - WSS port # for OPL3-SA chip (0x530,0xe80,0xf40,0x604) midi_port - port # for MPU-401 UART (0x300,0x330), -1 = disable fm_port - FM port # for OPL3-SA chip (0x388), -1 = disable irq - IRQ # for OPL3-SA chip (5,7,9,10) dma1 - first DMA # for Yamaha OPL3-SA chip (0,1,3) dma2 - second DMA # for Yamaha OPL3-SA chip (0,1,3), -1 = disable This module supports multiple cards and ISA PnP. It does not support autoprobe (if ISA PnP is not used) thus all ports must be specified!!! The power-management is supported. Module snd-opti92x-ad1848 ------------------------- Module for sound cards based on OPTi 82c92x and Analog Devices AD1848 chips. Module works with OAK Mozart cards as well. isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for WSS chip (0x530,0xe80,0xf40,0x604) mpu_port - port # for MPU-401 UART (0x300,0x310,0x320,0x330) fm_port - port # for OPL3 device (0x388) irq - IRQ # for WSS chip (5,7,9,10,11) mpu_irq - IRQ # for MPU-401 UART (5,7,9,10) dma1 - first DMA # for WSS chip (0,1,3) This module supports only one card, autoprobe and PnP. Module snd-opti92x-cs4231 ------------------------- Module for sound cards based on OPTi 82c92x and Crystal CS4231 chips. isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for WSS chip (0x530,0xe80,0xf40,0x604) mpu_port - port # for MPU-401 UART (0x300,0x310,0x320,0x330) fm_port - port # for OPL3 device (0x388) irq - IRQ # for WSS chip (5,7,9,10,11) mpu_irq - IRQ # for MPU-401 UART (5,7,9,10) dma1 - first DMA # for WSS chip (0,1,3) dma2 - second DMA # for WSS chip (0,1,3) This module supports only one card, autoprobe and PnP. Module snd-opti93x ------------------ Module for sound cards based on OPTi 82c93x chips. isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for WSS chip (0x530,0xe80,0xf40,0x604) mpu_port - port # for MPU-401 UART (0x300,0x310,0x320,0x330) fm_port - port # for OPL3 device (0x388) irq - IRQ # for WSS chip (5,7,9,10,11) mpu_irq - IRQ # for MPU-401 UART (5,7,9,10) dma1 - first DMA # for WSS chip (0,1,3) dma2 - second DMA # for WSS chip (0,1,3) This module supports only one card, autoprobe and PnP. Module snd-oxygen ----------------- Module for sound cards based on the C-Media CMI8788 chip: * Asound A-8788 * AuzenTech X-Meridian * Bgears b-Enspirer * Club3D Theatron DTS * HT-Omega Claro * Razer Barracuda AC-1 * Sondigo Inferno This module supports autoprobe and multiple cards. Module snd-pcsp ----------------- Module for internal PC-Speaker. nforce_wa - enable NForce chipset workaround. Expect bad sound. This module supports system beeps, some kind of PCM playback and even a few mixer controls. Module snd-pcxhr ---------------- Module for Digigram PCXHR boards This module supports multiple cards. Module snd-portman2x4 --------------------- Module for Midiman Portman 2x4 parallel port MIDI interface This module supports multiple cards. Module snd-powermac (on ppc only) --------------------------------- Module for PowerMac, iMac and iBook on-board soundchips enable_beep - enable beep using PCM (enabled as default) Module supports autoprobe a chip. Note: the driver may have problems regarding endianess. The power-management is supported. Module snd-pxa2xx-ac97 (on arm only) ------------------------------------ Module for AC97 driver for the Intel PXA2xx chip For ARM architecture only. The power-management is supported. Module snd-riptide ------------------ Module for Conexant Riptide chip joystick_port - Joystick port # (default: 0x200) mpu_port - MPU401 port # (default: 0x330) opl3_port - OPL3 port # (default: 0x388) This module supports multiple cards. The driver requires the firmware loader support on kernel. You need to install the firmware file "riptide.hex" to the standard firmware path (e.g. /lib/firmware). Module snd-rme32 ---------------- Module for RME Digi32, Digi32 Pro and Digi32/8 (Sek'd Prodif32, Prodif96 and Prodif Gold) sound cards. This module supports multiple cards. Module snd-rme96 ---------------- Module for RME Digi96, Digi96/8 and Digi96/8 PRO/PAD/PST sound cards. This module supports multiple cards. Module snd-rme9652 ------------------ Module for RME Digi9652 (Hammerfall, Hammerfall-Light) sound cards. precise_ptr - Enable precise pointer (doesn't work reliably). (default = 0) This module supports multiple cards. Note: snd-page-alloc module does the job which snd-hammerfall-mem module did formerly. It will allocate the buffers in advance when any RME9652 cards are found. To make the buffer allocation sure, load snd-page-alloc module in the early stage of boot sequence. See "Early Buffer Allocation" section. Module snd-sa11xx-uda1341 (on arm only) --------------------------------------- Module for Philips UDA1341TS on Compaq iPAQ H3600 sound card. Module supports only one card. Module has no enable and index options. The power-management is supported. Module snd-sb8 -------------- Module for 8-bit SoundBlaster cards: SoundBlaster 1.0, SoundBlaster 2.0, SoundBlaster Pro port - port # for SB DSP chip (0x220,0x240,0x260) irq - IRQ # for SB DSP chip (5,7,9,10) dma8 - DMA # for SB DSP chip (1,3) This module supports multiple cards and autoprobe. The power-management is supported. Module snd-sb16 and snd-sbawe ----------------------------- Module for 16-bit SoundBlaster cards: SoundBlaster 16 (PnP), SoundBlaster AWE 32 (PnP), SoundBlaster AWE 64 PnP mic_agc - Mic Auto-Gain-Control - 0 = disable, 1 = enable (default) csp - ASP/CSP chip support - 0 = disable (default), 1 = enable isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: port - port # for SB DSP 4.x chip (0x220,0x240,0x260) mpu_port - port # for MPU-401 UART (0x300,0x330), -1 = disable awe_port - base port # for EMU8000 synthesizer (0x620,0x640,0x660) (snd-sbawe module only) irq - IRQ # for SB DSP 4.x chip (5,7,9,10) dma8 - 8-bit DMA # for SB DSP 4.x chip (0,1,3) dma16 - 16-bit DMA # for SB DSP 4.x chip (5,6,7) This module supports multiple cards, autoprobe and ISA PnP. Note: To use Vibra16X cards in 16-bit half duplex mode, you must disable 16bit DMA with dma16 = -1 module parameter. Also, all Sound Blaster 16 type cards can operate in 16-bit half duplex mode through 8-bit DMA channel by disabling their 16-bit DMA channel. The power-management is supported. Module snd-sc6000 ----------------- Module for Gallant SC-6000 soundcard. port - Port # (0x220 or 0x240) mss_port - MSS Port # (0x530 or 0xe80) irq - IRQ # (5,7,9,10,11) mpu_irq - MPU-401 IRQ # (5,7,9,10) ,0 - no MPU-401 irq dma - DMA # (1,3,0) This module supports multiple cards. This card is also known as Audio Excel DSP 16 or Zoltrix AV302. Module snd-sgalaxy ------------------ Module for Aztech Sound Galaxy sound card. sbport - Port # for SB16 interface (0x220,0x240) wssport - Port # for WSS interface (0x530,0xe80,0xf40,0x604) irq - IRQ # (7,9,10,11) dma1 - DMA # This module supports multiple cards. The power-management is supported. Module snd-sscape ----------------- Module for ENSONIQ SoundScape PnP cards. port - Port # (PnP setup) wss_port - WSS Port # (PnP setup) irq - IRQ # (PnP setup) mpu_irq - MPU-401 IRQ # (PnP setup) dma - DMA # (PnP setup) dma2 - 2nd DMA # (PnP setup, -1 to disable) This module supports multiple cards. ISA PnP must be enabled. You need sscape_ctl tool in alsa-tools package for loading the microcode. Module snd-sun-amd7930 (on sparc only) -------------------------------------- Module for AMD7930 sound chips found on Sparcs. This module supports multiple cards. Module snd-sun-cs4231 (on sparc only) ------------------------------------- Module for CS4231 sound chips found on Sparcs. This module supports multiple cards. Module snd-sun-dbri (on sparc only) ----------------------------------- Module for DBRI sound chips found on Sparcs. This module supports multiple cards. Module snd-wavefront -------------------- Module for Turtle Beach Maui, Tropez and Tropez+ sound cards. use_cs4232_midi - Use CS4232 MPU-401 interface (inaccessibly located inside your computer) isapnp - ISA PnP detection - 0 = disable, 1 = enable (default) with isapnp=0, the following options are available: cs4232_pcm_port - Port # for CS4232 PCM interface. cs4232_pcm_irq - IRQ # for CS4232 PCM interface (5,7,9,11,12,15). cs4232_mpu_port - Port # for CS4232 MPU-401 interface. cs4232_mpu_irq - IRQ # for CS4232 MPU-401 interface (9,11,12,15). ics2115_port - Port # for ICS2115 ics2115_irq - IRQ # for ICS2115 fm_port - FM OPL-3 Port # dma1 - DMA1 # for CS4232 PCM interface. dma2 - DMA2 # for CS4232 PCM interface. The below are options for wavefront_synth features: wf_raw - Assume that we need to boot the OS (default:no) If yes, then during driver loading, the state of the board is ignored, and we reset the board and load the firmware anyway. fx_raw - Assume that the FX process needs help (default:yes) If false, we'll leave the FX processor in whatever state it is when the driver is loaded. The default is to download the microprogram and associated coefficients to set it up for "default" operation, whatever that means. debug_default - Debug parameters for card initialization wait_usecs - How long to wait without sleeping, usecs (default:150) This magic number seems to give pretty optimal throughput based on my limited experimentation. If you want to play around with it and find a better value, be my guest. Remember, the idea is to get a number that causes us to just busy wait for as many WaveFront commands as possible, without coming up with a number so large that we hog the whole CPU. Specifically, with this number, out of about 134,000 status waits, only about 250 result in a sleep. sleep_interval - How long to sleep when waiting for reply (default: 100) sleep_tries - How many times to try sleeping during a wait (default: 50) ospath - Pathname to processed ICS2115 OS firmware (default:wavefront.os) The path name of the ISC2115 OS firmware. In the recent version, it's handled via firmware loader framework, so it must be installed in the proper path, typically, /lib/firmware. reset_time - How long to wait for a reset to take effect (default:2) ramcheck_time - How many seconds to wait for the RAM test (default:20) osrun_time - How many seconds to wait for the ICS2115 OS (default:10) This module supports multiple cards and ISA PnP. Note: the firmware file "wavefront.os" was located in the earlier version in /etc. Now it's loaded via firmware loader, and must be in the proper firmware path, such as /lib/firmware. Copy (or symlink) the file appropriately if you get an error regarding firmware downloading after upgrading the kernel. Module snd-sonicvibes --------------------- Module for S3 SonicVibes PCI sound cards. * PINE Schubert 32 PCI reverb - Reverb Enable - 1 = enable, 0 = disable (default) - SoundCard must have onboard SRAM for this. mge - Mic Gain Enable - 1 = enable, 0 = disable (default) This module supports multiple cards and autoprobe. Module snd-serial-u16550 ------------------------ Module for UART16550A serial MIDI ports. port - port # for UART16550A chip irq - IRQ # for UART16550A chip, -1 = poll mode speed - speed in bauds (9600,19200,38400,57600,115200) 38400 = default base - base for divisor in bauds (57600,115200,230400,460800) 115200 = default outs - number of MIDI ports in a serial port (1-4) 1 = default adaptor - Type of adaptor. 0 = Soundcanvas, 1 = MS-124T, 2 = MS-124W S/A, 3 = MS-124W M/B, 4 = Generic This module supports multiple cards. This module does not support autoprobe thus the main port must be specified!!! Other options are optional. Module snd-trident ------------------ Module for Trident 4DWave DX/NX sound cards. * Best Union Miss Melody 4DWave PCI * HIS 4DWave PCI * Warpspeed ONSpeed 4DWave PCI * AzTech PCI 64-Q3D * Addonics SV 750 * CHIC True Sound 4Dwave * Shark Predator4D-PCI * Jaton SonicWave 4D * SiS SI7018 PCI Audio * Hoontech SoundTrack Digital 4DWave NX pcm_channels - max channels (voices) reserved for PCM wavetable_size - max wavetable size in kB (4-?kb) This module supports multiple cards and autoprobe. The power-management is supported. Module snd-usb-audio -------------------- Module for USB audio and USB MIDI devices. vid - Vendor ID for the device (optional) pid - Product ID for the device (optional) nrpacks - Max. number of packets per URB (default: 8) async_unlink - Use async unlink mode (default: yes) device_setup - Device specific magic number (optional) - Influence depends on the device - Default: 0x0000 ignore_ctl_error - Ignore any USB-controller regarding mixer interface (default: no) This module supports multiple devices, autoprobe and hotplugging. NB: nrpacks parameter can be modified dynamically via sysfs. Don't put the value over 20. Changing via sysfs has no sanity check. NB: async_unlink=0 would cause Oops. It remains just for debugging purpose (if any). NB: ignore_ctl_error=1 may help when you get an error at accessing the mixer element such as URB error -22. This happens on some buggy USB device or the controller. Module snd-usb-caiaq -------------------- Module for caiaq UB audio interfaces, * Native Instruments RigKontrol2 * Native Instruments Kore Controller * Native Instruments Audio Kontrol 1 * Native Instruments Audio 8 DJ This module supports multiple devices, autoprobe and hotplugging. Module snd-usb-usx2y -------------------- Module for Tascam USB US-122, US-224 and US-428 devices. This module supports multiple devices, autoprobe and hotplugging. Note: you need to load the firmware via usx2yloader utility included in alsa-tools and alsa-firmware packages. Module snd-via82xx ------------------ Module for AC'97 motherboards based on VIA 82C686A/686B, 8233, 8233A, 8233C, 8235, 8237 (south) bridge. mpu_port - 0x300,0x310,0x320,0x330, otherwise obtain BIOS setup [VIA686A/686B only] joystick - Enable joystick (default off) [VIA686A/686B only] ac97_clock - AC'97 codec clock base (default 48000Hz) dxs_support - support DXS channels, 0 = auto (default), 1 = enable, 2 = disable, 3 = 48k only, 4 = no VRA, 5 = enable any sample rate and different sample rates on different channels [VIA8233/C, 8235, 8237 only] ac97_quirk - AC'97 workaround for strange hardware See "AC97 Quirk Option" section below. This module supports one chip and autoprobe. Note: on some SMP motherboards like MSI 694D the interrupts might not be generated properly. In such a case, please try to set the SMP (or MPS) version on BIOS to 1.1 instead of default value 1.4. Then the interrupt number will be assigned under 15. You might also upgrade your BIOS. Note: VIA8233/5/7 (not VIA8233A) can support DXS (direct sound) channels as the first PCM. On these channels, up to 4 streams can be played at the same time, and the controller can perform sample rate conversion with separate rates for each channel. As default (dxs_support = 0), 48k fixed rate is chosen except for the known devices since the output is often noisy except for 48k on some mother boards due to the bug of BIOS. Please try once dxs_support=5 and if it works on other sample rates (e.g. 44.1kHz of mp3 playback), please let us know the PCI subsystem vendor/device id's (output of "lspci -nv"). If dxs_support=5 does not work, try dxs_support=4; if it doesn't work too, try dxs_support=1. (dxs_support=1 is usually for old motherboards. The correct implemented board should work with 4 or 5.) If it still doesn't work and the default setting is ok, dxs_support=3 is the right choice. If the default setting doesn't work at all, try dxs_support=2 to disable the DXS channels. In any cases, please let us know the result and the subsystem vendor/device ids. See "Links and Addresses" below. Note: for the MPU401 on VIA823x, use snd-mpu401 driver additionally. The mpu_port option is for VIA686 chips only. The power-management is supported. Module snd-via82xx-modem ------------------------ Module for VIA82xx AC97 modem ac97_clock - AC'97 codec clock base (default 48000Hz) This module supports one card and autoprobe. Note: The default index value of this module is -2, i.e. the first slot is excluded. The power-management is supported. Module snd-virmidi ------------------ Module for virtual rawmidi devices. This module creates virtual rawmidi devices which communicate to the corresponding ALSA sequencer ports. midi_devs - MIDI devices # (1-4, default=4) This module supports multiple cards. Module snd-virtuoso ------------------- Module for sound cards based on the Asus AV100/AV200 chips, i.e., Xonar D1, DX, D2, D2X and HDAV1.3 (Deluxe). This module supports autoprobe and multiple cards. Module snd-vx222 ---------------- Module for Digigram VX-Pocket VX222, V222 v2 and Mic cards. mic - Enable Microphone on V222 Mic (NYI) ibl - Capture IBL size. (default = 0, minimum size) This module supports multiple cards. When the driver is compiled as a module and the hotplug firmware is supported, the firmware data is loaded via hotplug automatically. Install the necessary firmware files in alsa-firmware package. When no hotplug fw loader is available, you need to load the firmware via vxloader utility in alsa-tools package. To invoke vxloader automatically, add the following to /etc/modprobe.conf install snd-vx222 /sbin/modprobe --first-time -i snd-vx222 && /usr/bin/vxloader (for 2.2/2.4 kernels, add "post-install /usr/bin/vxloader" to /etc/modules.conf, instead.) IBL size defines the interrupts period for PCM. The smaller size gives smaller latency but leads to more CPU consumption, too. The size is usually aligned to 126. As default (=0), the smallest size is chosen. The possible IBL values can be found in /proc/asound/cardX/vx-status proc file. The power-management is supported. Module snd-vxpocket ------------------- Module for Digigram VX-Pocket VX2 and 440 PCMCIA cards. ibl - Capture IBL size. (default = 0, minimum size) This module supports multiple cards. The module is compiled only when PCMCIA is supported on kernel. With the older 2.6.x kernel, to activate the driver via the card manager, you'll need to set up /etc/pcmcia/vxpocket.conf. See the sound/pcmcia/vx/vxpocket.c. 2.6.13 or later kernel requires no longer require a config file. When the driver is compiled as a module and the hotplug firmware is supported, the firmware data is loaded via hotplug automatically. Install the necessary firmware files in alsa-firmware package. When no hotplug fw loader is available, you need to load the firmware via vxloader utility in alsa-tools package. About capture IBL, see the description of snd-vx222 module. Note: snd-vxp440 driver is merged to snd-vxpocket driver since ALSA 1.0.10. The power-management is supported. Module snd-ymfpci ----------------- Module for Yamaha PCI chips (YMF72x, YMF74x & YMF75x). mpu_port - 0x300,0x330,0x332,0x334, 0 (disable) by default, 1 (auto-detect for YMF744/754 only) fm_port - 0x388,0x398,0x3a0,0x3a8, 0 (disable) by default 1 (auto-detect for YMF744/754 only) joystick_port - 0x201,0x202,0x204,0x205, 0 (disable) by default, 1 (auto-detect) rear_switch - enable shared rear/line-in switch (bool) This module supports autoprobe and multiple chips. The power-management is supported. Module snd-pdaudiocf -------------------- Module for Sound Core PDAudioCF sound card. The power-management is supported. AC97 Quirk Option ================= The ac97_quirk option is used to enable/override the workaround for specific devices on drivers for on-board AC'97 controllers like snd-intel8x0. Some hardware have swapped output pins between Master and Headphone, or Surround (thanks to confusion of AC'97 specifications from version to version :-) The driver provides the auto-detection of known problematic devices, but some might be unknown or wrongly detected. In such a case, pass the proper value with this option. The following strings are accepted: - default Don't override the default setting - none Disable the quirk - hp_only Bind Master and Headphone controls as a single control - swap_hp Swap headphone and master controls - swap_surround Swap master and surround controls - ad_sharing For AD1985, turn on OMS bit and use headphone - alc_jack For ALC65x, turn on the jack sense mode - inv_eapd Inverted EAPD implementation - mute_led Bind EAPD bit for turning on/off mute LED For backward compatibility, the corresponding integer value -1, 0, ... are accepted, too. For example, if "Master" volume control has no effect on your device but only "Headphone" does, pass ac97_quirk=hp_only module option. Configuring Non-ISAPNP Cards ============================ When the kernel is configured with ISA-PnP support, the modules supporting the isapnp cards will have module options "isapnp". If this option is set, *only* the ISA-PnP devices will be probed. For probing the non ISA-PnP cards, you have to pass "isapnp=0" option together with the proper i/o and irq configuration. When the kernel is configured without ISA-PnP support, isapnp option will be not built in. Module Autoloading Support ========================== The ALSA drivers can be loaded automatically on demand by defining module aliases. The string 'snd-card-%1' is requested for ALSA native devices where %i is sound card number from zero to seven. To auto-load an ALSA driver for OSS services, define the string 'sound-slot-%i' where %i means the slot number for OSS, which corresponds to the card index of ALSA. Usually, define this as the same card module. An example configuration for a single emu10k1 card is like below: ----- /etc/modprobe.conf alias snd-card-0 snd-emu10k1 alias sound-slot-0 snd-emu10k1 ----- /etc/modprobe.conf The available number of auto-loaded sound cards depends on the module option "cards_limit" of snd module. As default it's set to 1. To enable the auto-loading of multiple cards, specify the number of sound cards in that option. When multiple cards are available, it'd better to specify the index number for each card via module option, too, so that the order of cards is kept consistent. An example configuration for two sound cards is like below: ----- /etc/modprobe.conf # ALSA portion options snd cards_limit=2 alias snd-card-0 snd-interwave alias snd-card-1 snd-ens1371 options snd-interwave index=0 options snd-ens1371 index=1 # OSS/Free portion alias sound-slot-0 snd-interwave alias sound-slot-1 snd-ens1371 ----- /etc/modprobe.conf In this example, the interwave card is always loaded as the first card (index 0) and ens1371 as the second (index 1). Alternative (and new) way to fixate the slot assignment is to use "slots" option of snd module. In the case above, specify like the following: options snd slots=snd-interwave,snd-ens1371 Then, the first slot (#0) is reserved for snd-interwave driver, and the second (#1) for snd-ens1371. You can omit index option in each driver if slots option is used (although you can still have them at the same time as long as they don't conflict). The slots option is especially useful for avoiding the possible hot-plugging and the resultant slot conflict. For example, in the case above again, the first two slots are already reserved. If any other driver (e.g. snd-usb-audio) is loaded before snd-interwave or snd-ens1371, it will be assigned to the third or later slot. When a module name is given with '!', the slot will be given for any modules but that name. For example, "slots=!snd-pcsp" will reserve the first slot for any modules but snd-pcsp. ALSA PCM devices to OSS devices mapping ======================================= /dev/snd/pcmC0D0[c|p] -> /dev/audio0 (/dev/audio) -> minor 4 /dev/snd/pcmC0D0[c|p] -> /dev/dsp0 (/dev/dsp) -> minor 3 /dev/snd/pcmC0D1[c|p] -> /dev/adsp0 (/dev/adsp) -> minor 12 /dev/snd/pcmC1D0[c|p] -> /dev/audio1 -> minor 4+16 = 20 /dev/snd/pcmC1D0[c|p] -> /dev/dsp1 -> minor 3+16 = 19 /dev/snd/pcmC1D1[c|p] -> /dev/adsp1 -> minor 12+16 = 28 /dev/snd/pcmC2D0[c|p] -> /dev/audio2 -> minor 4+32 = 36 /dev/snd/pcmC2D0[c|p] -> /dev/dsp2 -> minor 3+32 = 39 /dev/snd/pcmC2D1[c|p] -> /dev/adsp2 -> minor 12+32 = 44 The first number from /dev/snd/pcmC{X}D{Y}[c|p] expression means sound card number and second means device number. The ALSA devices have either 'c' or 'p' suffix indicating the direction, capture and playback, respectively. Please note that the device mapping above may be varied via the module options of snd-pcm-oss module. Proc interfaces (/proc/asound) ============================== /proc/asound/card#/pcm#[cp]/oss ------------------------------- String "erase" - erase all additional informations about OSS applications String " []" - name of application with (higher priority) or without path - number of fragments or zero if auto - size of fragment in bytes or zero if auto - optional parameters - disable the application tries to open a pcm device for this channel but does not want to use it. (Cause a bug or mmap needs) It's good for Quake etc... - direct don't use plugins - block force block mode (rvplayer) - non-block force non-block mode - whole-frag write only whole fragments (optimization affecting playback only) - no-silence do not fill silence ahead to avoid clicks - buggy-ptr Returns the whitespace blocks in GETOPTR ioctl instead of filled blocks Example: echo "x11amp 128 16384" > /proc/asound/card0/pcm0p/oss echo "squake 0 0 disable" > /proc/asound/card0/pcm0c/oss echo "rvplayer 0 0 block" > /proc/asound/card0/pcm0p/oss Early Buffer Allocation ======================= Some drivers (e.g. hdsp) require the large contiguous buffers, and sometimes it's too late to find such spaces when the driver module is actually loaded due to memory fragmentation. You can pre-allocate the PCM buffers by loading snd-page-alloc module and write commands to its proc file in prior, for example, in the early boot stage like /etc/init.d/*.local scripts. Reading the proc file /proc/drivers/snd-page-alloc shows the current usage of page allocation. In writing, you can send the following commands to the snd-page-alloc driver: - add VENDOR DEVICE MASK SIZE BUFFERS VENDOR and DEVICE are PCI vendor and device IDs. They take integer numbers (0x prefix is needed for the hex). MASK is the PCI DMA mask. Pass 0 if not restricted. SIZE is the size of each buffer to allocate. You can pass k and m suffix for KB and MB. The max number is 16MB. BUFFERS is the number of buffers to allocate. It must be greater than 0. The max number is 4. - erase This will erase the all pre-allocated buffers which are not in use. Links and Addresses =================== ALSA project homepage http://www.alsa-project.org ALSA Bug Tracking System https://bugtrack.alsa-project.org/bugs/ ALSA Developers ML mailto:alsa-devel@alsa-project.org