From: Mws <mws@twisted-brains.org>
To: Linus Torvalds <torvalds@osdl.org>
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default
Date: Wed, 15 Nov 2006 22:10:46 +0100
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Cc: Jeff Garzik <jeff@garzik.org>, Krzysztof Halasa <khc@pm.waw.pl>,
       David Miller <davem@davemloft.net>, linux-kernel@vger.kernel.org,
       tiwai@suse.de, Olivier Nicolas <olivn@trollprod.org>
References: <Pine.LNX.4.64.0611141846190.3349@woody.osdl.org> <200611152059.53845.mws@twisted-brains.org> <Pine.LNX.4.64.0611151210380.3349@woody.osdl.org>
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On Wednesday 15 November 2006 21:14, Linus Torvalds wrote:
> 
> On Wed, 15 Nov 2006, Mws wrote:
> > 
> > after some small discussions on alsa-user ml i recognised this
> > thread today. 
> > i thought my problem could also exist on this msi stuff.
> > i disabled msi in kernel config, reboot, and, after starting x & kde
> > i got immediately a freeze.
> > last and maybe important last try has been to
> > enable msi support _but_ boot kernel with cmdline pci=nomsi
> > this finally did work out. i got a working sound environment again.
> 
> I expect that you have the exact same issue as Olivier: the "hang" is 
> probably because you started using the sound device (beeping on the 
> console is handled by the old built-in speaker, but in X a single beep 
> tends to be due to sound device drivers), and because of sound irq 
> misrouting you had some other device (like your harddisk) that got their 
> irq disabled due to the "nobody cared" issue.
> 
> > i find it a bit abnormal that the disabling msi in kernel config behaviour
> > is different from kernel cmdline pci=nomsi option.
> 
> Now, that does actually worry me. It _should_ have worked with CONFIG_MSI 
> disabled. I wonder if some of the MSI workarounds actually broke the HDA 
> driver subtly.
> 
> Anyway, it would be a good idea to test the current -git tree if you can, 
> both with CONFIG_MSI and without (and _without_ any "pci=nomsi" kernel 
> command line). It should hopefully work, exactly because the HDA driver 
> now shouldn't even try to do any MSI stuff by default.
> 
> Knock wood.
> 
> 		Linus
hi,

linus, just cloned current git, but will test it tomorrow morning.

will inform you on the results.

thanks 
marcel
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