--- zzzz-none-000/linux-2.6.28.10/drivers/usb/serial/usb-serial.c	2009-05-02 18:54:43.000000000 +0000
+++ puma5-6360-529/linux-2.6.28.10/drivers/usb/serial/usb-serial.c	2010-04-22 12:12:59.000000000 +0000
@@ -1141,6 +1141,12 @@
 							| HUPCL | CLOCAL;
 	usb_serial_tty_driver->init_termios.c_ispeed = 9600;
 	usb_serial_tty_driver->init_termios.c_ospeed = 9600;
+	
+	/* WK/AVM Patch from AVM Kernel 2.6.19 */
+	/* 20081210 WK/AVM CHG: avoid local echo in tty layer */
+	usb_serial_tty_driver->init_termios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE);
+	
+
 	tty_set_operations(usb_serial_tty_driver, &serial_ops);
 	result = tty_register_driver(usb_serial_tty_driver);
 	if (result) {