[Intel-gfx] Sandy Bridge GPU hang reproducer...

[Chris Wilson]

On Wed, 18 May 2011 12:38:44 +0100, Daniel J Blueman <daniel.blueman at gmail.com> wrote:
> Hi Chris et al,
> 
> On my Sandy Bridge GPU (8086:0126 rev 09) laptop, I often see hangs
> that are correctly recovered and sometimes ones which aren't (causing
> X lockup or kernel hard lock), hurting usability.
> 
> I'm able to reproduce GPU hangs often with the composite tests in
> rendercheck (may need to restart a few times):
> 
> $ ./rendercheck -t composite,cacomposite
> Begin composite mask test on a8
> <command hang, maybe GPU hang too>

Reproducing use rendercheck is unusual, as that is something that we do
run frequently.

Looking through the i915_error_state made me wince (lots of 1x1 copies
over the same pixel...) but it does remind me of

  https://bugzilla.kernel.org/show_bug.cgi?id=27892

for which the workaround is to flush the caches after every op (Option
"DebugFlushCaches" "True").
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre