[Bug 72752] [BYT Regression]eDP shows black screen while testing testdisplay -f 38.25,800,832,912,1024,600,603,607,624

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72752

Guo Jinxian <jinxianx.guo at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #3 from Guo Jinxian <jinxianx.guo at intel.com> ---
(In reply to comment #1)
> Can you please bisect where this regression has been introduced?

After bisect, We found first bad point on -next-queued branch
commit dff392dbd258381a6c3164f38420593f2d291e3b
Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
Date:   Fri Dec 6 17:32:41 2013 -0200

    drm/i915: don't touch the VDD when disabling the panel

    I don't see a reason to touch VDD when we're disabling the panel:
    since the panel is enabled, we don't need VDD. This saves a few sleep
    calls from the vdd_on and vdd_off functions at every modeset.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=69693
    Reviewed-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
    Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
    [danvet: Fix the patch mangle wiggle has done ... Spotted by Paulo.
    Also drop the runtime_pm_put call which now has to go due to different
    patch ordering. Also from Paul.]
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

Reverted this commit, the bug unable to reproduce.

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