linux-kernel - Re: [ALSA hda 3.4-rc] suspend2ram regression in snd_hda

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Date:	Sun, 06 May 2012 12:32:14 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Takashi Iwai <tiwai@...e.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	David Henningsson <david.henningsson@...onical.com>
Subject: Re: [ALSA hda 3.4-rc] suspend2ram regression in snd_hda_intel

Konstantin Khlebnikov wrote:
> Mainline commit 785f857d1cb0856b612b46a0545b74aa2596e44a
> ("ALSA: hda - Set codec to D3 forcibly even if not used")
> breaks sound for my notebook (thinkpad x220),
> looks like codec cannot wake from power-save state after resume.
> After reverting looks like all works fine.
>
> how to reproduce:
> * unplug the power cord (to enable hda power safe mode)
> * play something and stop
> * wait until the background noise disappears (codec went into power-save mode)
> * suspend
> * resume
> * play something again and hear the silence
> --
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Bump

BTW, I don't see any locks around hda power-save code, for example  hda_power_work() reads
codec->power_on and codec->power_count without any locks. This seems racy.
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