[Bug 68030] [Haswell] blank Screen with intel ddx on first use right after using fbdev ddx. Breaking SuSE Install

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68030

--- Comment #30 from Chris Wilson <chris at chris-wilson.co.uk> ---
i-g-t commit 0b19cb5dc2afe55084b946b053c527b9f44a011f
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Oct 3 18:30:56 2013 +0200

    tests/kms_flip: Check the dpms confusion

    Some kernels inadvertedly forwarded dpms changes to crtcs connected to
    shared encoders even though that specific output wasn't enabled.
    Hilarity ensued.

    Note that we only have shared encoders on hsw (DP+HDMI) and with sdvo
    cards (multi-function encoders).

    v2: Do a full OFF->ON->OFF transition to make sure something actually
    happens.

    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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