LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Takashi Iwai <tiwai@suse.de>
To: "Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br>
Cc: linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org
Subject: Re: snd-hda-intel prevents machine to power off
Date: Tue, 28 Oct 2008 17:51:30 +0100	[thread overview]
Message-ID: <s5hod14br3h.wl%tiwai@suse.de> (raw)
In-Reply-To: <20081028141916.610a2847@doriath.conectiva>

At Tue, 28 Oct 2008 14:19:16 -0200,
Luiz Fernando N. Capitulino wrote:
> 
> Em Tue, 28 Oct 2008 17:07:42 +0100
> Takashi Iwai <tiwai@suse.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).

OK, then it's hard to see.
A good news is that it goes at least fairly end point, thus likely no
hanging task, etc.


> | >  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

Looking through the comments that the power-saving helps, the problem
may disappear even without disabling the pci device.  The power-saving
doesn't involve with pci_disable_device() or changing the power-state
of the controler.  So, at least, the problem is either in the codec
or the controller setup.

Suppose you already use the power-saving and it solves the shutdown
problem, could you set power_save_controller=0 option for
snd-hda-intel, and check whether the shutdown still works or not?
If the shutdown doesn't work with this option, it means that
azx_stop_chip() is what would be needed.

Anyway, I feel this is rather a BIOS issue, and not sure what is the
best way to fix in the driver itself...


Takashi

  reply	other threads:[~2008-10-28 16:51 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-28 15:59 Luiz Fernando N. Capitulino
2008-10-28 16:07 ` Takashi Iwai
2008-10-28 16:19   ` Luiz Fernando N. Capitulino
2008-10-28 16:51     ` Takashi Iwai [this message]
2008-10-28 18:44       ` Luiz Fernando N. Capitulino
2008-10-28 19:12         ` Takashi Iwai
2008-10-29  7:58           ` Takashi Iwai
2008-10-29 15:12             ` Luiz Fernando N. Capitulino

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=s5hod14br3h.wl%tiwai@suse.de \
    --to=tiwai@suse.de \
    --cc=alsa-devel@alsa-project.org \
    --cc=lcapitulino@mandriva.com.br \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: snd-hda-intel prevents machine to power off' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).