[Bug 91894] [snb] GPU Hangs since Kernel-4.2 upgrade (global/aliasing ppgtt issue?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91894

--- Comment #12 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hmm. Can you verify that running with 0875546c5318c85c13d07014af5350e9000bc9e9^
(i.e. the commit before the bisect result) is stable (say over the course of a
few days)?

The patch you just tested suggests that it is not a result of the lack of
aliased GGTT entries, which is perhaps the most obvious effect of the bisected
commit.

Spotted one fumble in the patch, but that was fixed in

commit 5e562f1dddfa3242cede5ec49888260a856a9da2
Author: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Date:   Thu Apr 30 11:02:31 2015 +0300

    drm/i915: Clear vma->bound on unbinding

in v4.2-rc1.

Do you suspend/resume the system before the hang appears?

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