linux-kernel - Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

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Message-Id: <200611152210.47238.mws@twisted-brains.org>
Date:	Wed, 15 Nov 2006 22:10:46 +0100
From:	Mws <mws@...sted-brains.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Jeff Garzik <jeff@...zik.org>, Krzysztof Halasa <khc@...waw.pl>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, tiwai@...e.de,
	Olivier Nicolas <olivn@...llprod.org>
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

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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