As an appendix to the instructions posted by Aldrin in comment #11, if you want 
to install the module in a more permanent way, replace the last step (sudo 
insmod ...) by this:
$ uname -r > include/config/kernel.release
$ sudo make M=drivers/video/backlight modules_install

-- 
[i915][kms] kernel backlight interface missing for macbooks
https://bugs.launchpad.net/bugs/511965
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