[Bug 89589] [dp mst] External displays remain blank with linux-3.18.6 after resuming from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89589

--- Comment #8 from Daniel Martin <consume.noise at gmail.com> ---
Bisected down to:

commit e7d6f7d708290da1b7c92f533444b042c79412e0
Author: Dave Airlie <airlied at redhat.com>
Date:   Mon Dec 8 13:23:37 2014 +1000

    drm/i915: resume MST after reading back hw state

    Otherwise the MST resume paths can hit DPMS paths
    which hit state checker paths, which hit WARN_ON,
    because the state checker is inconsistent with the
    hw.

    This fixes a bunch of WARN_ON's on resume after
    undocking.
    ...


Reverting this commit fixes the problem, but brings the warnings back. :/

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