[Bug 86936] Facilitate override on minimum brightness level

[bugzilla-daemon at freedesktop.org]

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

--- Comment #2 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Aurabindo J from comment #0)
> Associated commit:
> 
> commit e1c412e75754ab7b7002f3e18a2652d999c40d4b
> Author: Jani Nikula <jani.nikula at intel.com>
> Date:   Wed Nov 5 14:46:31 2014 +0200
> 
>     drm/i915: safeguard against too high minimum brightness
>     
>     Never trust (your interpretation of) the VBT. Regression from
>     
>     commit 6dda730e55f412a6dfb181cae6784822ba463847
>     Author: Jani Nikula <jani.nikula at intel.com>
>     Date:   Tue Jun 24 18:27:40 2014 +0300
>     
>         drm/i915: respect the VBT minimum backlight brightness

The first commit ("drm/i915: respect the VBT minimum backlight brightness") is
the real culprit in your case. It starts restricting the minimum brightness
based on VBT. The VBT value is supposed to have been selected by the OEM to
match the hardware requirements.

The second commit ("drm/i915: safeguard against too high minimum brightness")
ensures the limit isn't "too high". It should *not* be effective in your case,
where the minimum per VBT is (15/255)*max, i.e. you can't go below 5%.

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