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?

-----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.

Hi Takashi, Thanks for your info. I took readouts of both modes and notice they are both in 16LE format but mplayer/smplayer is using oss emulation. Is there a way to try them with native Alsa? I have attached the dumps. Is there anything I can do for this (besides switch to OSS)?

-----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

At Tue, 24 Jun 2008 01:25:11 -0700, stan wrote:

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.

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

At Wed, 25 Jun 2008 11:38:49 +0200, Pavel Hofman wrote:

...

...

...

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.

Is this bug still in git alsa? I thought it was already fixed. Which cards does it afflict?

AFAIK, revo71 had this kind of problem, and I don't remember any fixes about this.

Takashi