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

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Date:	Fri, 04 May 2012 11:21:21 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Takashi Iwai <tiwai@...e.de>, alsa-devel@...a-project.org
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [ALSA hda 3.4-rc] suspend2ram regression in snd_hda_intel

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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