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

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Date:	Tue, 14 Nov 2006 18:58:49 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

On Tue, 14 Nov 2006 21:40:33 -0500 Jeff Garzik wrote:

> Linus Torvalds wrote:
> > 
> > On Tue, 14 Nov 2006, Jeff Garzik wrote:
> >> :(  Like AHCI, PCI MSI has -always- worked wonderfully for HD audio AFAIK.
> > 
> > That "AFAIK" is shorthand for "As Far As I haven't read any of the 
> > bug-reports but Know", right?
> 
> None of the bug reports indicate Intel, thus following the well 
> established pattern of "it works great on Intel, but not elsewhere"
> 
> 
> >> Is a whitelist patch forthcoming?
> > 
> > Probably not. The advantages of MSI aren't all that obvious, and the 
> > disadvantages seem to be that it just doesn't work all that well for some 
> > people.
> > 
> > The fact that it works for MOST people has absolutely zero relevance. 
> > We've had too many frigging patches that have apparently been of the "this 
> > works for me, I don't care if some other motherboard has problems" kind.
> > 
> > See for example:
> > 
> > 	http://lkml.org/lkml/2006/10/7/164
> > 
> > and yes, that HDA MSI _does_ seem to be causing problems.
> 
> But not on Intel, hence the obvious whitelist question.
> 
> 
> > So don't blather about "MSI never causes problems". It's broken. Please 
> > stop living in denial.
> > 
> > When somebody can actually say what the huge advantages to MSI are that 
> > it's worth using when 
> > 
> >  (a) several motherboards are apparently known broken
> 
> several non-Intel motherboards
> 
> 
> >  (b) microsoft apparently is of the same opinion and _also_ doesn't use it
> 
> Yeah well, that's sage advice only when it's sage advice.  MS lags us by 
> years.  We do some bleeding, on the bleeding edge.
> 
> 
> >  (c) the old non-MSI code works fine
> > 
> >  (d) there is apparently no fool-proof way to tell when it works and when 
> >      it doesn't.
> > 
> > then please holler. Btw, I'm not even _interested_ in any advantages 
> > unless you also have a solution for (d). Not a "it should work". I want to 
> > hear something that is _guaranteed_ to work.
> 
> if (intel) ...
> 
> That has a track record of working.
> 
> It's nice not to have to deal with shared interrupts.

FWIW, I concur with it always working for me on my Intel motherboard and
Intel-based Lenovo ThinkPad for hdaudio, ethernet, and SATA/AHCI.

---
~Randy
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