[alsa-devel] hda-intel channels hibernate bug

[Takashi Iwai]

At Wed, 15 Apr 2009 17:40:02 +0200,
Johannes Berg wrote:
> 
> On Wed, 2009-04-15 at 16:12 +0200, Takashi Iwai wrote:
> > At Tue, 14 Apr 2009 15:43:33 +0200,
> > Johannes Berg wrote:
> > > 
> > > On Tue, 2009-04-14 at 15:40 +0200, Takashi Iwai wrote:
> > > 
> > > > >  Node 0x0d [Audio Mixer] wcaps 0x20010f: Stereo Amp-In Amp-Out
> > > > >    Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
> > > > > -  Amp-In vals:  [0x00 0x00] [0x00 0x00]
> > > > > +  Amp-In vals:  [0x80 0x80] [0x00 0x00]
> > > > >    Amp-Out caps: ofs=0x40, nsteps=0x40, stepsize=0x03, mute=0
> > > > >    Amp-Out vals:  [0x25 0x25]
> > > > >    Connection: 2
> > > > 
> > > > So the widget 0x0d is muted.  Maybe the channel mode control
> > > > doesn't do caching the value properly...
> > > 
> > > No idea :)
> > > 
> > > > Could you give the raw alsa-info.sh output?
> > > 
> > > Sure, below (before hibernating).
> > 
> > Thanks.  Could you try the patch below?
> 
> Yes, this helps, thanks. Mind you, if I play music with mplayer _while_
> hibernating, I get a horrible buzzing when waking up and mplayer says:
> 
> [AO_ALSA] alsa-lib: pcm_hw.c:727:(snd_pcm_hw_resume)
> SNDRV_PCM_IOCTL_RESUME failed: Function not implemented

This is actually no fatal error.  It appears because libao sets
its own error logger.  But...

> Needed to kill mplayer but the channels control is remembered properly.

... Necessity of kill sounds like a bug in either libao or else.

Anyway, I'll add the patch to the next pull request.


thanks,

Takashi