linux-kernel - Re: snd-hda-intel prevents machine to power off

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Message-ID: <20081028141916.610a2847@doriath.conectiva>
Date:	Tue, 28 Oct 2008 14:19:16 -0200
From:	"Luiz Fernando N. Capitulino" <lcapitulino@...driva.com.br>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: snd-hda-intel prevents machine to power off

Em Tue, 28 Oct 2008 17:07:42 +0100
Takashi Iwai <tiwai@...e.de> escreveu:

| >  Hi Takashi,
| > 
| >  If I have some process with the sound device opened in my eeepc
| > (say KDE's kmix) and try to power off the machine, for example with:
| > 
| > # echo o > /proc/sysrq-trigger
| > 
| >  The machine will not power off.
| 
| At which point does it stop?
| What shows alt-sysrq-t (or w) output?

 I'm wondering how to get that kind of output because everything
is disabled at that point (display inclusive).

| >  But it does work if I remove the snd-hda-intel module before issuing
| > the echo above.
| > 
| >  This problem seems to be pretty popular among distros, I could find
| > it reported for Mandriva, Ubuntu and Fedora.
| 
| Hmm, I haven't heard of unfixed issues.

 Well, these are the tickets I've found:

https://bugzilla.redhat.com/show_bug.cgi?id=444115
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/126140
https://qa.mandriva.com/show_bug.cgi?id=44752

| >  Its workaround is also documented in a few wikis: people are doing
| > a 'rmmod snd-hda-intel' in the last halt stage (ie, halt script
| > in etc).
| 
| I hate wiki or forum just recommending a wrong workaround :)

 Yeah.

-- 
Luiz Fernando N. Capitulino
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