Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752927AbYJ1Qvl (ORCPT ); Tue, 28 Oct 2008 12:51:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752435AbYJ1Qvd (ORCPT ); Tue, 28 Oct 2008 12:51:33 -0400 Received: from mail.suse.de ([195.135.220.2]:56462 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751594AbYJ1Qvc (ORCPT ); Tue, 28 Oct 2008 12:51:32 -0400 Date: Tue, 28 Oct 2008 17:51:30 +0100 Message-ID: From: Takashi Iwai To: "Luiz Fernando N. Capitulino" Cc: linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org Subject: Re: snd-hda-intel prevents machine to power off In-Reply-To: <20081028141916.610a2847@doriath.conectiva> References: <20081028135933.36778d60@doriath.conectiva> <20081028141916.610a2847@doriath.conectiva> User-Agent: Wanderlust/2.12.0 (Your Wildest Dreams) SEMI/1.14.6 (Maruoka) FLIM/1.14.7 (=?ISO-8859-4?Q?Sanj=F2?=) APEL/10.6 Emacs/22.3 (x86_64-suse-linux-gnu) MULE/5.0 (SAKAKI) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2206 Lines: 62 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 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/