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

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Date:	Thu, 03 Jan 2013 10:19:24 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Vincent Blut <vincent.debian@...e.fr>
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [3.6.9 -> 3.7.1 regression] sound: snd_hda_intel codec probing issue?

At Fri, 28 Dec 2012 15:25:40 +0100,
Vincent Blut wrote:
> 
> 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?

If it's new in 3.7, this could be a regression by runtime D3.
Try to pass power_save_controller=0 option to snd-hda-intel module
(or change it via sysfs dynamically).


thanks,

Takashi
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