This is related to the kernel interracting with the bios that "caters to 
windows 8"
this issued shows up after a bios update i was able to get software to control 
the backlight properly on the 3.6.11 kernel, but not on anything newer than that
see the upstream bug report for more info

i never cared for using the fn brightness keys to control my brightness,
i only use software to manage it

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https://bugs.launchpad.net/bugs/1138168

Title:
  Backlight control regression

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