linux-kernel - [3.6.9 -> 3.7.1 regression] sound: snd_hda

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Date:	Fri, 28 Dec 2012 15:25:40 +0100
From:	Vincent Blut <vincent.debian@...e.fr>
To:	alsa-devel@...a-project.org
Cc:	linux-kernel@...r.kernel.org, tiwai@...e.de
Subject: [3.6.9 -> 3.7.1 regression] sound: snd_hda_intel codec probing
 issue?

Hi,

Since I updated to Linux 3.7.1, listening to some audio/video bits
frequently cause the following:

[ 7896.166946] hda-intel: azx_get_response timeout, switching to polling
mode: last cmd=0x020c0000
[ 7897.173444] hda-intel: No response from codec, disabling MSI: last
cmd=0x020c0000
[ 7898.179932] hda_intel: azx_get_response timeout, switching to
single_cmd mode: last cmd=0x020c0000
[ 7898.179983] hda-codec: out of range cmd 0:0:20:400:fffff7ff
[ 9445.034371] plugin-containe[5873]: segfault at 7f44bb95e639 ip
00007f44e454bca0 sp 00007f44c91165f8 error 4 in
libc-2.13.so[7f44e442c000+180000]

It seems to be a codec probing failure (?). This is really fatal because
the sound become very choppy and can't recover until I reboot.
I'll try to play with 'probe_mask' kernel parameter to see if I can
narrow the correct codec slots!

By the way I can't reproduce this on 3.6.9, so is there something that
changed in this area in 3.7.1?

Cheers,
Vincent

[attached alsa-info output]

View attachment "alsa-info.txt.8iqmjXNAIA" of type "text/plain" (28417 bytes)