[Bug 81940] [BDW Bisected]eDP can't be lighted up after Xrandr rotate

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81940

--- Comment #2 from Yi Sun <yi.sun at intel.com> ---
(In reply to comment #1)
> I can't reproduce this under Unity. Which desktop environment are you using?

Lei is on his vocation till next Monday.
I just tested it, only started X without any desktop env.

Actually I found, it needn't X to reproduce this issue:
setterm -blank force
setterm -blank poke

Then the screen is black but the back-light turns on. So it should be X or
desktop non-related, I think.

I have tried it with latest drm-intel-nightly branch:
commit ddbc288690cd888dd6f5629ccba9a2691a70b7b0
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Jul 31 10:07:44 2014 +0200

    drm-intel-nightly: 2014y-07m-31d-10h-07m-17s integration manifest

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