[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 #14 from Simon Farnsworth <simon at farnz.org.uk> ---
Created attachment 95088
  --> https://bugs.freedesktop.org/attachment.cgi?id=95088&action=edit
Error state that goes with the hang

Had a hopeful event - I've got the failure recurring, with an error state this
time. Ickle's patch gets me:

# cat /sys/kernel/debug/dri/0/i915_gem_pageflip 
Flip queued on pipe A (plane A)
Flip queued on frame 32131, now 3102655
Stall check enabled, 1 prepares
Old framebuffer gtt_offset 0x00372000
New framebuffer gtt_offset 0x08022000
MMIO update completed? 0
No flip due on pipe B (plane B)

showing that the flip hasn't happened, so it's not unblocking.

I'm not 100% confident that the failure and the error state coincide in time -
I'm happy to be told that they're not linked, and that I should report the
error state as a separate bug.

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