linux-kernel - 2.6.29 regression: left audio channel broken after resume from suspend with Intel HDA

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Date:	Mon, 20 Apr 2009 20:40:24 +0200
From:	Tino Keitel <tino.keitel@...ei.de>
To:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	tiwai@...e.de
Subject: 2.6.29 regression: left audio channel broken after resume from
	suspend with Intel HDA

Hi,

since 2.6.29 and also with 2.6.29.1 the left audio channel of the
digital output of my Mac mini Core 2 Duo is noisy.  This didn't happen
with 2.6.28.  Unloading snd-hda-intel and reloading it does fix the
noisy sound.

This happened with some older versions of the Linux kernel (with an
older Mac mini Core Duo, I don't remeber which kernel version), but got
fixed at some point.  Now it happens again with 2.6.29.

Here is the dmesg output for the sound hardware:

HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
HDA Intel 0000:00:1b.0: setting latency timer to 64
hda_codec: STAC922x, Apple subsys_id=100
input: HDA Intel Line In at Ext Left Jack as /class/input/input18
input: HDA Intel Mic at Ext Left Jack as /class/input/input19
input: HDA Intel HP Out at Ext Left Jack as /class/input/input20

Any hints what I could try to fix this, maybe some commit that I should
try to revert?

Regards,
Tino
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