[alsa-devel] via82xx: unreliable audio, strange mixer behavior
tiwai at suse.de
Fri Nov 21 12:59:10 CET 2008
At Thu, 20 Nov 2008 12:04:09 -0500,
Forest Bond wrote:
> I'm using snd-via82xx on an Ubuntu 8.04 system. alsa-info.sh output is here:
> Here are the symptoms:
> Audio goes away after a semi-random interval. Sometimes it returns after
> `modprobe -r snd-via82xx' followed by `modprobe snd-via82xx', but sometimes it
> seems to take a full reboot.
> This looks similar to:
> Some folks think that this kind of issue is triggered by audio volume being
> above a certain level. I'm not entirely sure if this is true, but I think it
> is. One time, I apparently triggered the issue by unplugging and replugging the
> audio cable from the mainboard during playback.
> Audio can be heard even when the PCM volume level is 0 (as told by alsamixer).
> The volume does get louder when I turn up that mixer control, but it never goes
> away entirely when I turn the volume to zero. Mute works as expected.
The volume 0 doesn't always mean the mute on several hardwares.
So this can be irrelevant if it happens always.
I vaguely remember about the low-power mode of some codec chips.
Which codec chip does your system have? Please run alsa-info.sh with
--no-upload option, and attach the output file.
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