--- zzzz-none-000/linux-4.4.60/include/sound/pcm.h	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/include/sound/pcm.h	2018-11-08 13:36:17.000000000 +0000
@@ -100,7 +100,7 @@
 #endif
 
 #define SNDRV_PCM_IOCTL1_RESET		0
-#define SNDRV_PCM_IOCTL1_INFO		1
+/* 1 is absent slot. */
 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO	2
 #define SNDRV_PCM_IOCTL1_GSTATE		3
 #define SNDRV_PCM_IOCTL1_FIFO_SIZE	4