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

From: Jeff Garzik
Date: Tue Nov 14 2006 - 21:40:53 EST


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.

Jeff


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