[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 #32 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 72e909953c1865f86fbd6325ff807d7c7357af5f
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Feb 13 09:46:13 2014 +0000

    Revert "uxa: Do not change DPMS mode on unconnected outputs"

    This reverts commit 4497212307dee5e35bc6836201738a2fdb559020.

    Unfortunately, this simple fix does not work for UXA as DPMS is used by
    the xserver to turn off CRTCs and outputs. Since UXA does not implement
    CRTC DPMS, this commit causes us to fail to turn off outputs.

    The kernel has been fixed up in the meantime and that commit has been
    recommended to be backported to all stable kernels:

    commit c9976dcf55c8aaa7037427b239f15e5acfc01a3a
    Author: Chris Wilson <chris at chris-wilson.co.uk>
    Date:   Sun Sep 29 19:15:07 2013 +0100

        drm/i915: Only apply DPMS to the encoder if enabled

    so it should be safe for UXA to rely on its old behaviour.

    Bugzilla: https://code.google.com/p/chromium/issues/detail?id=341135
    References: https://bugs.freedesktop.org/show_bug.cgi?id=68030
    Suggested-by: Dominik Behr <dbehr at google.com>
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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