At Thu, 26 Jun 2008 03:28:42 +0800, Ashwin.Chandra@corel.com wrote:

Hi Takashi, Actually now I am noticing the problem (left speaker only) with mplayer/smplayer in their OSS emulation as well. It seems to happen once I run my player first, then after that the other players exhibit the problem.

In this case, mplayer will choose the ALSA mode automatically, I guess. So the problem appears to be ALSA-mode specific, possibly about dmix.

Try to define the following in ~/.asoundrc: pcm.!default "plughw"

then it won't use dmix as default any more. (Then you can use only one app at the same time, of course.) Check whether the problem can be reproduced with this setting.

Takashi

Sometimes after muting and unmuting my player, the problem goes away and also away on the players. It is almost like my player is causing bad internal state for the audio driver. Do you have any suggestions to work around this?

-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Wednesday, June 25, 2008 3:23 AM To: Ashwin Chandra Cc: alsa-devel@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@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@cox.net] Sent: Tuesday, June 24, 2008 1:25 AM To: Ashwin Chandra Cc: alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Alsa Issue - Sound playback starts on left speaker only

Ashwin.Chandra@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. _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel