[Bug 94250] Intel driver crashes when undocking Lenovo T450s

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94250

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
Ok, found one scenario that could explain the traces after a failed flip when
undocking, so please test with:

commit 64b1b1f10da59f15a91141c9f76d7d09517f8ea8
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Feb 23 09:32:57 2016 +0000

    sna/dri2: Ensure the flipqueue is drained on pageflip failure

    If we fail to queue a flip for a CRTC, we attempt to restore the
    original mode. However, if the failure is on a second CRTC, the queued
    flip on the first will still complete causing us to process the event
    twice.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=94250
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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