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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - machine hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85888#c8">Comment # 8</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - machine hang"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85888">bug 85888</a>
from <span class="vcard"><a class="email" href="mailto:tvboxspy@gmail.com" title="Malcolm <tvboxspy@gmail.com>"> <span class="fn">Malcolm</span></a>
</span></b>
<pre>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.</pre>
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