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

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Date:	Thu, 16 Nov 2006 12:10:15 +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 22:10, Mws wrote:
> 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

hi, 

i just tried the git that i cloned yesterday, when you asked me to, linus.

i don't get any freezes and sound is fine.
no cmdline option pci=nomsi and msi enabled in .config

thanks for your help.

best regards
marcel
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