[Bug 81515] [IVB Regression] Backlight is not adjustable and set at maximum level in kernels 3.16-rcX on HD 4000

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81515

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |aaron.lu at intel.com

--- Comment #11 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #7)
> Finally I found a workaround ( had to go and see the code for an appropriate
> kernel parameter). So with video.use_native_backlight=-1 (not sure what it
> really means) the backlight works as before. The /sys/class/backlight folder
> also contains:
> acpi_video0  acpi_video1  intel_backlight.

CC Aaron, seems like acpi backlight is required on this one.

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