[Bug 85888] machine hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85888

--- Comment #9 from Jim <jimmcdevitt60 at gmail.com> ---
(In reply to Malcolm from comment #8)
> I also have the same hang on playing videos or graphic operations.
> 
> use_mmio_flip=1 makes no difference
> 
> I have bisected it to
> d6bbafa183793537d8dca4d4c2e448805e59448a
> drm/i915: Check for a stalled page flip after each vblank
> and
> 9c787942907face82da505c2c5493998b56cfc5a
> drm/i915: Decouple the stuck pageflip on modeset
> 
> Reverting these commits restores trouble free operation.
> 
> The trouble starts in i915_handle_vblank, I am just reverting just the
> changes made to this function for now.

I tried just in case I missed something but that was to no avail. I think I've
got it down to 3 commits, but it is a little more complicated than that.

Thanks for the post! It's really annoying.

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