I tested patch @ #11, and brightness does not work. I also used the
drivrs/acpi/video.c in kernel 3.5, and brightness does not work either.
I executed "lsmod | grep 915" and found this Haswell system does not
have i915 running. The brightness may not be working for more than one
reason - including kernel 3.2 does not support Haswell, which is
supported in Kernel 3.5.
** Changed in: linux (Ubuntu)
Status: In Progress => Won't Fix
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https://bugs.launchpad.net/bugs/1250764
Title:
[Dell Latitude E6440] Unable to adjust brightness on Precise
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