Comment # 24 on bug 1180749 from
Okay, I've tested with your possible fix. But it did not work. Now
/sys/class/backlight/actual_brightness reports valid values which is the same
as /sys/class/backlight/brightness 

Now when I change the brightness both /sys/class/backlight/actual_brightness
and /sys/class/backlight/brightness reports valid values but still the display
brightness is at maximum and does not change.

Seems like this is not a easy fix.

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