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authorTakashi Iwai <tiwai@suse.de>2008-08-13 15:40:53 +0200
committerJaroslav Kysela <perex@perex.cz>2008-08-15 11:48:01 +0200
commit7a9b8063cf7d78d7de4f2555357101087548c699 (patch)
treee52206406078301f572057597ba45eb0a7a413ca /Documentation/sound
parent8a8f2662c535e1dedced896cc68cb8473fd98fa0 (diff)
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>
Diffstat (limited to 'Documentation/sound')
-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 68bbc25ff39..b33e030509f 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -1983,6 +1983,8 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
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 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
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
--------------------