[alsa-devel] via82xx: unreliable audio, strange mixer behavior

[Takashi Iwai]

At Fri, 21 Nov 2008 07:08:23 -0500,
Forest Bond wrote:
> 
> Hi,
> 
> On Fri, Nov 21, 2008 at 12:59:10PM +0100, Takashi Iwai wrote:
> > At Thu, 20 Nov 2008 12:04:09 -0500,
> > Forest Bond wrote:
> >> 
> >> Hi,
> >> 
> >> I'm using snd-via82xx on an Ubuntu 8.04 system.  alsa-info.sh output is here:
> >> 
> >> http://www.alsa-project.org/db/?f=1c3d5570e7b57d4d2f79b964a323dd7b4efd7e78
> >> 
> >> 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:
> >> 
> >> https://bugtrack.alsa-project.org/alsa-bug/view.php?id=3D3194
> >> 
> >> 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.
> 
> The output would be the same as what was already uploaded, right?  I've attached
> that output here for your convenience.

Thanks, it's always better to post the content than a URL.

Any chance to try the later version of alsa-driver?
Yours looks pretty old.


Takashi