linux-kernel - !!Re: sound: BUG: can't load gdm greeter on battery with Linux 3.5

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Date:	Sun, 05 Aug 2012 15:06:00 +0200
From:	Vincent Blut <vincent.debian@...e.fr>
To:	Takashi Iwai <tiwai@...e.de>
CC:	dgreid@...omium.org, perex@...ex.cz, linux-kernel@...r.kernel.org
Subject: !!Re: sound: BUG: can't load gdm greeter on battery with Linux 3.5

Le 05/08/2012 14:57, Takashi Iwai a écrit :
> At Sun, 05 Aug 2012 14:36:19 +0200,
> Vincent Blut wrote:
>> Hi,
>>
>> Despite that the subject might suggest that this is a bug in the graphic
>> stack, it appears that
>> commit [b4a91cf0] makes the GDM greeter not loadable, however GDM has
>> been correctly loaded:
>>
>> # service gdm3 status
>> [ ok ] gdm3 is running.
>>
>> This issue only affects Linux 3.5 when I boot on battery, I spent some
>> time to bisect and  this commit seems to be the bad one:
>>
>> commit b4a91cf05c33d4ab5b2b3738a257a3fe49b462bd
>> Author: Dylan Reid <dgreid@...omium.org>
>> Date:   Fri Jun 15 19:36:23 2012 -0700
>>
>>     ALSA: hda - Handle open while transitioning to D3.
>>    
>>     This addresses an issue encountered when a pcm is opened while
>>     transitioning to low power state (codec->power_on == 1 &&
>>     codec->power_transition == -1).  Add snd_pcm_power_up_d3wait to
>>     hda_codec.  This function is used to power up from azx_open as opposed
>>     to snd_hda_power_up used from codec_exec_verb. When powering up from
>>     azx_open, wait for pending power downs to complete, avoiding the power
>>     up continuing in parallel with the power down on the work queue.
>>    
>>     The specific issue seen was with the CS4210 codec, it powers off the ADC
>>     and DAC nid in its suspend handler.  If it is re-opened before the
>>     ~100ms power down process completes, the ADC and DAC nid are initialized
>>     while powered down and audio is lost until another suspend/resume cycle.
>>    
>>     Signed-off-by: Dylan Reid <dgreid@...omium.org>
>>     Signed-off-by: Takashi Iwai <tiwai@...e.de>
>>
>> Is this a known issue?
> Yes.  There is a known side-effect by this change, and the fix was
> already queued for 3.5.1 stable kernel.
>
>
> thanks,
>
> Takashi
Ok, thanks a lot Takashi for the quick answer!

Cheers,
Vincent
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