[Bug 70791] [HSW ULT]eDP brightness is zero after the computer start

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70791

--- Comment #5 from Qingshuai Tian <qingshuai.tian at intel.com> ---
Yes It does show the grub menu, but it will go black when it start to  load
kernel after I choose one and click "enter". 

I tried video.use_bios_initial_backlight=0 parameter on latest
drm-intel-next-queued branch.  The eDP works well and won't turn into black
again. 

And it seems that there is no difference whether I use the patch and
"video.use_native_backlight=1" module parameter or not.

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