[alsa-devel] Alsa Issue - Sound playback starts on left speaker only

[Takashi Iwai]

At Tue, 24 Jun 2008 01:25:11 -0700,
stan wrote:
> 
> Ashwin.Chandra at corel.com wrote:
> >  
> >
> > Hello,
> >
> > I am having an issue with my playback application where upon playback
> > start, only the left speaker is outputted. But if I mute and unmute
> > (either through my application or using alsamixer), the sound playback
> > resumes on both left and right speakers. This only happens on a
> > particular system too (out of 5 systems). But I know it is my issue
> > because mplayer or smplayer works fine.
> >
> >  
> >
> > I believe I am setting the correct HW params (ie. 2 channels), etc.
> >
> >  
> >
> > Any ideas?
> >
> >  
> >
> > Thanks!
> >
> >   
> The ICE1724 driver has exactly this behavior.  It is a known bug and has 
> been there for years.
> You don't say what chip is having the problem, but I would guess that 
> this is it.  Most people
> just program a script to adjust the volume at startup to cure it.

Well, this is likely a different problem.  The case of envy24*
drivers, the problem is the initialization of the registers via
I2C/SPI.  But, in the case of HD-audio, this can't be the case.

I fixed a similar case with VIA HD-audio codecs by limiting the
supported PCM formats to 16.  The 24 bit format was buggy on them.
Possibly a similar situation.


Takashi