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

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Date:	Wed, 15 Nov 2006 20:01:18 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Jeff Garzik <jeff@...zik.org>, Takashi Iwai <tiwai@...e.de>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

On Wed, 2006-11-15 at 10:51 -0800, Linus Torvalds wrote:
> So I think it's either: (a) irqbalance doesn't balance MSI interrupts at 
> all or (b) the MSI interrupt code doesn't honor balancing requests even if 
> it does.

it's (A) right now for sure for irqbalanced at least.

> The suspend problem reported by Stephen is another such thing - where MSI 
> itself wasn't a problem, but stupid (probably broken) firmware code at 
> wakeup broke it by an unforseen interaction. Again, that is probably 
> related to the fact that nobody has ever really tested it (ie firmware 
> "engineers" obviously didn't actually ever test anything with MSI enabled 
> and in use, and there really is no excuse for firmware messing with the 
> MSI setting - other than the usual "firmware is inevitably buggy" thing).

ok so maybe this should be in the linux firmware kit.. it has
suspend/resume tests after all ;)

if there is a "do this then this to reproduce" scenario it's even likely
it's trivial to put into a testcase...

> 
> 			Linus
-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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