ALSA: usb-audio - Add ignore_ctl_error parameter
Added the ignore_ctl_error parameter to enable/disable the control-error
handling for mixer interfaces. It was a hard-coded ifdef, and now you
can change it more easily.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 68bbc25..b33e030 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -1983,6 +1983,8 @@
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.
@@ -1991,6 +1993,9 @@
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
--------------------