[Bug 75502] [SNB] Page flips hang indefinitely, apparently waiting for interrupts that never happen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75502

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 94763
  --> https://bugs.freedesktop.org/attachment.cgi?id=94763&action=edit
check that the pageflip is truly stuck before crying

Simon, would be good to run with this patch - but first make the fixup an
DRM_ERROR so that we can easily see if it fires.

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