linux-kernel - Re: PROBLEM: snd_intel_hda audio regression in 2.6.36-rc5

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Date:	Wed, 22 Sep 2010 18:31:26 +0300
From:	Aki Parviainen <aki.parviainen@....fi>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	perex@...ex.cz
Subject: Re: PROBLEM: snd_intel_hda audio regression in 2.6.36-rc5

>
> So, you are testing only over SPDIF output, right?

Yes, I'm only using SPDIF output!

> Looks like the SPDIF status bits has been reset by some reason.
> Try to restore via iecset program included in alsa-utils package,
> e.g.
>    iecset original on
>    iecset category 0x02

I tried this and didn't notice any difference.

>
> If this doesn't help, try to unload sound driver once, remove (or
> backup) /etc/asound.state (which might be in a different path
> depending on the distro), then load sound modules again.
> This will restore the default SPDIF status.  Unmute / adjust mixer
> setups appropriately after doing this.

I also tried this but didn't notice a difference but however I noticed
a workaround to this problem that might be related to deleting the
asound.state (debian places it btw to /var/lib/alsa/asound.state): now
the regular audio works via SPDIF once again if I first play a file
with digital preencoded audio. Ie:

-Boot with 2.6.36-rc5
-Start kaffeine
-Play mp3 file -> no sound at all via spdif
-Play mkv file with 5.1 sound -> sound ok
-Play mp3 file again -> sound ok!
-Exit kaffeine & restart kaffeine or vlc
-Play mp3 file again -> sound ok!

Unfortunately the fix isn't permanent because after reboot I cannot
get regular sound via spdif until I have once played a file with 5.1
audio track.

Yours,

Aki
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