[Bug 103046] [ivb] hangs with 4.13

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103046

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
I think DebugPresent is the avenue we want to persue, it will at least give us
clue as to the sequence that lead up to the hang. On top of that,
drm.debug=0x1e may help, but if it is bad userspace timing not so much.

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