[Bug 75502] [SNB, IVB libva+rc6] 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 #33 from Simon Farnsworth <simon at farnz.org.uk> ---
Created attachment 97218
  --> https://bugs.freedesktop.org/attachment.cgi?id=97218&action=edit
error state collected during hang.

Error state collected from a stalled box.

 # grep . /sys/kernel/debug/dri/0/i915_gem_pageflip 
Flip queued on pipe A (plane A)
Flip queued on frame 4876195, now 5100833
Stall check enabled, 1 prepares
Current scanout address 0x01061000
Old framebuffer address 0x01061000
New framebuffer address 0x0085b000
MMIO update completed? 0
No flip due on pipe B (plane B)

is the stall.

I'm running 3.14.0-0.rc7 with the patches from this bug applied.

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