[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

--- Comment #14 from Aaron Lu <aaron.lu at intel.com> ---
The ACPI backlight setting is done through EC, the fact that ACPI interface
works while GPU doesn't suggests that the hardware circuit for backlight
setting is hooked into EC instead of the GPU? And this is a Win8 laptop...

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