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Old 07-24-2010, 06:07 PM
Julien Cristau
 
Default Bug#590193: i915: fix for intel gen3 hangs

Package: linux-2.6
Version: 2.6.32-18
Severity: normal
Tags: patch upstream fixed-upstream

Hi,

2.6.35-rc6 included two patches fixing various gpu hangs on intel gen3
hw (915/945), it would be good to have them in sid. The first provides
some register definitions, the second has the actual fix.

commit 45503ded966c98e604c9667c0b458d40666b9ef3
Author: Keith Packard <keithp@keithp.com>
Date: Mon Jul 19 21:12:35 2010 -0700

drm/i915: Define MI_ARB_STATE bits

The i915 memory arbiter has a register full of configuration
bits which are currently not defined in the driver header file.

Signed-off-by: Keith Packard <keithp@keithp.com>
cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

commit 944001201ca0196bcdb088129e5866a9f379d08c
Author: Dave Airlie <airlied@redhat.com>
Date: Tue Jul 20 13:15:31 2010 +1000

drm/i915: enable low power render writes on GEN3 hardware.

A lot of 945GMs have had stability issues for a long time, this manifested as X hangs, blitter engine hangs, and lots of crashes.

one such report is at:
https://bugs.freedesktop.org/show_bug.cgi?id=20560

along with numerous distro bugzillas.

This only took a week of digging and hair ripping to figure out.

Tracked down and tested on a 945GM Lenovo T60,
previously running
x11perf -copypixwin500
or
x11perf -copywinpix500
repeatedly would cause the GPU to wedge within 4 or 5 tries, with random busy bits set.

After this patch no hangs were observed.

cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

Cheers,
Julien
 

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