[Bug 68471] Display extremely dark on Dell XPS 13 since 3.10 Kernel in EFI mode

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68471

--- Comment #20 from Dennis Jacobfeuerborn <dennisml at conversis.de> ---
After building a kernel from the drm-nightly-branch i can confirm that with
that kernel things seem to work as expected.

There is one minor difference though: The max_backlight value is 4882 and under
the 3.9.9 kernel I can use the keys to increase brightness until it reaches
4882. On the drm-intel-nightly kernel however the actual brightness only goes
up to 4845 using the keys but I can echo 4882 into the brightness file and
actual_brightness will reflect that. Since the brightness is only changed in
increments it seems under 3.9.9 some sort of code like "if (brightness <=
max_brightness_inc) ..." is used but in the new code the <= changed to < maybe
which would only allow you to reach max_brightness_inc-1?

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