[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 #10 from Aaron Lu <aaron.lu at intel.com> ---
(In reply to comment #9)
> Created attachment 88330 [details]
> dmesg with win8 patch and video.use_native_backlight=1
> 
> I tested the latest kernel on drm-intel-next-queued branch with the patch
> applied and video.use_native_backlight=1 set in kernel cmdline. 
> And there IS the directory acpi_video0 in /sys/class/backlight.

Then this system's firmware must not claim win8 support.

> 
> 
> >For ACPI bugs, it is probably better to fill a new bug in kernel bugzilla.
> 
> Do you mean that you want me to report this bug on bugzilla.kernel.org?

Yes please, and please attach acpidump when submitting this bug, thanks.
Choose ACPI / Power-Video when submitting.

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