linux-kernel - Re: [Bug #12765] i915 VT switch with AIGLX causes X lock up

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Message-ID: <20090427094651.7cc09227@hobbes>
Date:	Mon, 27 Apr 2009 09:46:51 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"Dave Airlie" <airlied@...hat.com>,
	"DRI" <dri-devel@...ts.sourceforge.net>,
	"Michel Dänzer" <michel@...nzer.net>,
	"Sitsofe Wheeler" <sitsofe@...oo.com>
Subject: Re: [Bug #12765] i915 VT switch with AIGLX causes X lock up

On Sun, 26 Apr 2009 11:46:26 +0200 (CEST)
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> This message has been generated automatically as a part of a report
> of regressions introduced between 2.6.28 and 2.6.29.
> 
> The following bug entry is on the current list of known regressions
> introduced between 2.6.28 and 2.6.29.  Please verify if it still
> should be listed and let me know (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=12765
> Subject		: i915 VT switch with AIGLX causes X lock up
> Submitter	: Sitsofe Wheeler <sitsofe@...oo.com>
> Date		: 2009-02-21 15:38 (65 days old)
> First-Bad-Commit:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=14d200c5e5bd19219d930bbb9a5a22758c8f5bec
> References	:
> http://marc.info/?l=linux-kernel&m=123523074304955&w=4

I think we had a workaround for this (attached), but it sounds like
Robert has tracked down the root cause (search for "Broken vblanks on
Intel" on dri-devel@...ts.sourceforge.net).  Will try to get the fix
into the Intel driver soon.  Fortunately this doesn't seem to be biting
a lot of people (at least not that I've heard); I certainly have a hard
time reproducing it.

-- 
Jesse Barnes, Intel Open Source Technology Center

View attachment "drm-vblank-wait-fix.patch" of type "text/x-patch" (1373 bytes)