[Bug 55984] [ilk regression] gpu hangs on ironlake with 3.6 + -next + -fixes code

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55984

--- Comment #108 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 71926
  --> https://bugs.freedesktop.org/attachment.cgi?id=71926&action=edit
Mark unused portions of the GTT as invalid

Working on the theory that this is an invalid access beyond the end of a bo,
this should hopefully enable GPU detection.

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