linux-next 20160512 - ACPI issue with screen brightness

[Valdis Kletnieks]

next-20160512 sets the screen brightness to about 40%-ish or so, rather
than the 100% intensity I want.

Dell Latitude E6530 laptop.

git bisect tells me:

059500940defe285222d3b189b366dfe7f299cae is the first bad commit
commit 059500940defe285222d3b189b366dfe7f299cae
Author: Aaron Lu <aaron.lu@xxxxxxxxx>
Date:   Wed Apr 27 20:45:04 2016 +0800

    ACPI/video: export acpi_video_get_levels

    The acpi_video_get_levels is useful for other drivers, i.e. the
    to-be-added int3406 thermal driver, so export it.

    Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

:040000 040000 24f4f5abe8beda2fa219dee7549faacc2f63e29f dfbe3a3bb4f58d82d5be768263d91172276fed98 M      drivers
:040000 040000 603ffbf36e76717fe4f4ecb0418c9dbc59c76e25 a559bcd81c949a6471ffd045866df9b4e3fa4406 M      include


but I've stared at the code and don't see what would do this....

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