[Bug 86936] Facilitate override on minimum brightness level

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86936

--- Comment #6 from Jani Nikula <jani.nikula at intel.com> ---
Please attach dmesg with drm.debug=14 module parameter set with a newer kernel
(=including both commits).

15 is a value extracted from the VBT (which is in the opregion you attached).
It is a coefficient (15/255)*max where max is max_brightness. That translates
to the max being about 5% of the max.

The minimum brightness should *not* affect what you can set the brightness
interface to. All values 0..max_brightness are allowed, and it should just
scale the input suitable for hardware.

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