[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 #12 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #11)
> It takes two to three hours to fail each time, and has sometimes lasted as
> long as 3 days before failing.
> 
> git bisect suggests that I've got 16 steps to try to get there on the kernel
> alone, at worst case time of 3 days per step.
> 
> Do you have any further clues I could push on before I dive into bisection?

If the fail/success is so imbalanced you can try to skew the bisect by picking
commits which are more likely to be bad than the perfect middle one (since you
can detect those faster). Unfortunately there's no cmdline option for this, so
you need to do this by hand.

There was a write-up somewhere, but I can't find it any more. Probably not
worth the bother though ...

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