[Bug 79996] [SNB bisected] GPU hang Linux 3.15 (Shuttle SH67, Xeon E3 1235)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79996

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 100999
  --> https://bugs.freedesktop.org/attachment.cgi?id=100999&action=edit
Clear all unwanted bits from GT_MODE

This preserves our later tweaking for msaa and w/a and makes sure there is
nothing else in there. If that still hangs, it would be useful to then disable
the two GT_MODE writes and see which is the problem.

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