[alsa-devel] [Alsa-devel] [i8x0] docking station audio-out ceased to work

[Takashi Iwai]

At Mon, 02 Apr 2007 13:41:21 +0200,
Andreas Happe wrote:
> 
> On Mon, 2007-04-02 at 13:27 +0200, Takashi Iwai wrote:
> > Still wondering why setting AC97-SPSA to 0 doesn't work in this
> > case.  Try the following:
> > 
> > - plug to the analog output on docking station
> > - set "IEC958 Playback AC97-SPSA" to zero via alsamixer or whatever
> > - set "IEC958 Playback Switch" on
> > - run
> > 	% aplay -Ddefault foo.wav
> 
> | aplay -Ddefault shutdown.wav 
> Playing WAVE 'shutdown.wav' : Signed 16 bit Little Endian, Rate 44100
> Hz, Stereo
> 
> -> Silence
> 
> | aplay -Dspdif startup.wav 
> aplay: main:550: audio open error: Device or resource busy
> 
> -> I got the totem player open in the background, it didn't produce any
> sounds but seems to lock the pcm channel.
> 
> After closing totem player:
> 
> | arcs at storm:/usr/share/sounds$ aplay -Dspdif startup.wav 
> Playing WAVE 'startup.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
> Stereo
> 
> -> played sound
> 
> | aplay -Ddefault startup.wav 
> Playing WAVE 'startup.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,
> Stereo
> 
> -> still no sound
> 
> hoped that helped.

Make sure that AC97-SPSA is reset to zero before you play via default
PCM.

Also, you can compare ac97 regsiters by dumping the proc file
/proc/asound/card0/codec97#0/*-0+regs file between playing "spdif" and
"default" PCMs.  Then you can see at least whether any ac97 register
is changed.


Takashi