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snd-hda-intel prevents machine to power off

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From: Luiz Fernando N. Capitulino
Subject: snd-hda-intel prevents machine to power off
Date: Tuesday, October 28, 2008 - 8:59 am

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.

 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.

 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 have tested with 2.6.27.4 and latest 2.7.28-rc2.

 How I can I help you to debug this?

 Thanks.

-- 
Luiz Fernando N. Capitulino
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Messages in current thread:
snd-hda-intel prevents machine to power off, Luiz Fernando N. Cap ..., (Tue Oct 28, 8:59 am)
Re: snd-hda-intel prevents machine to power off, Takashi Iwai, (Tue Oct 28, 9:07 am)
Re: snd-hda-intel prevents machine to power off, Luiz Fernando N. Cap ..., (Tue Oct 28, 9:19 am)
Re: snd-hda-intel prevents machine to power off, Takashi Iwai, (Tue Oct 28, 9:51 am)
Re: snd-hda-intel prevents machine to power off, Luiz Fernando N. Cap ..., (Tue Oct 28, 11:44 am)
Re: snd-hda-intel prevents machine to power off, Takashi Iwai, (Tue Oct 28, 12:12 pm)
Re: snd-hda-intel prevents machine to power off, Takashi Iwai, (Wed Oct 29, 12:58 am)
Re: snd-hda-intel prevents machine to power off, Luiz Fernando N. Cap ..., (Wed Oct 29, 8:12 am)