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

[Ashwin.Chandra at corel.com]

Hi Takashi,
Some more findings: mplayer run in alsa native mode doesn't have the
issue. A dump of /proc/asound/.../sub0/* is identical in both my player
and mplayer-alsa mode, yet mine still suffers from left speaker issue.
Is there something I am not setting properly?


-----Original Message-----
From: Takashi Iwai [mailto:tiwai at suse.de] 
Sent: Wednesday, June 25, 2008 3:23 AM
To: Ashwin Chandra
Cc: alsa-devel at alsa-project.org
Subject: Re: [alsa-devel] Alsa Issue - Sound playback starts on left
speaker only

At Wed, 25 Jun 2008 01:52:16 +0800,
<Ashwin.Chandra at corel.com> wrote:
> 
> I have an Intel ALC861VD. Other players (mplayer, smplayer, aplay)
don't
> seem to exhibit this problem. Is there any workaround I can do in my
> application so that upon first time sound playback, I can get it to
play
> on both channels?

Check /proc/asound/card0/pcm0p/sub0/* files and compare between
working and non-working states.  I guess the working case uses OSS
emulation or 16bit format.

If so, try to add the following to ~/.asoundrc:

  defaults.pcm.dmix.format S16_LE


Takashi

> 
> -----Original Message-----
> From: stan [mailto:ghjeold_i_mwee at cox.net] 
> Sent: Tuesday, June 24, 2008 1:25 AM
> To: Ashwin Chandra
> Cc: alsa-devel at alsa-project.org
> Subject: Re: [alsa-devel] Alsa Issue - Sound playback starts on left
> speaker only
> 
> 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.
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