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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #15 from Chris Wilson <chris at chris-wilson.co.uk> ---
Indeed that hang is a separate issue, the infamous bug 54226.

For the flip stall detection, I think I basically need a full request with
tracking seqno so that we can check after a vblank for the completed flip
command but pending mmio.

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