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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75502#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75502">bug 75502</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>Indeed that hang is a separate issue, the infamous <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)"
href="show_bug.cgi?id=54226">bug 54226</a>.
For the flip stall detection, I think I basically need a full request with
tracking seqno so that we can check after a vblank for the completed flip
command but pending mmio.</pre>
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