[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

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|intel-gfx-bugs at lists.freede |przanoni at gmail.com
                   |sktop.org                   |

--- Comment #4 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #3)
> 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.

I suggest we revert that and reopen bug 69693. Assigning to Paulo.

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