[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 #7 from Aaron Lu <aaron.lu at intel.com> ---
(In reply to comment #6)
> (In reply to comment #5)
> > 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. 
> 
> Aaron, possibly another one for an ACPI initial backlight quirk. Although
> I'm slightly surprised your win8 native backlight patches don't help.

Me too, surprised.
The video.use_bios_initial_backlight=0 will cause ACPI video not do a backlight
level set based on value from _BQC, which might be buggy for a first time
evaluation. But if my win8 native backlight patches got applied and
video.use_native_backlight=1 is set, that set is also skipped, so it should
solve the problem too...

Hi Qingshuai,
Can you please verify, with the win8 native backlight patch applied and
video.use_native_backlight=1 set in kernel cmdline, there is no acpi_video0 in
/sys/class/backlight.

> 
> For future reference, would you like to have new bug reports on
> bugzilla.kernel.org for these, or is it okay to re-assign the bugs here to
> you?

I'm OK with both ways :-)

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