[Bug 82612] [SNB/IVB] [drm:intel_pipe_set_base] *ERROR* pipe is still busy with an old pageflip (kernel 3.16.0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82612

--- Comment #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
In drm-intel-nightly, we have

commit 9c787942907face82da505c2c5493998b56cfc5a
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Sep 5 07:13:25 2014 +0100

    drm/i915: Decouple the stuck pageflip on modeset

    If we successfully confuse the hardware, and cause it to drop a queued
    pageflip, we wait for 60s and issue a warning before continuing on with
    the modeset. However, this leaves the pending pageflip still stuck
    indefinitely. Pretend to userspace that it does complete, and let us
    start afresh following the modeset.

which should keep the system alive after the failure. Could you please try a
kernel based on http://cgit.freedesktop.org/drm-intel/ #drm-intel-nightly and
check that the system does recover, and then see if we have some more
information about the root cause?

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