[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

--- Comment #6 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to comment #4)
> (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.

According to the spec, we should be doing the correct thing now, so I'm in
favor of spending a little bit of time on the proper fix before we decide to
revert. But I don't have a BYT machine, so if someone wants to help, please :)

There's also the possibility of doing a BYT-revert-only or a
ILK-SNB-IVB-BYT-revert-only (leaving HSW+ untouched).

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