Rather bizarrely, I can't get it to work with any of the mainline
kernels.  Even going back to 3.9.11-030911-generic which should work
(since the real 3.10.0-6 works fine) I get no brightness control.

I've also noticed the screen never seems to get turned off.  After a
while it will blank the screen, but the backlight is still on.  This may
be completely unconnected, but thought I'd mention it here just in case
it may be relevant.

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https://bugs.launchpad.net/bugs/1229591

Title:
  display brightness keys don't generate evdev events after saucy
  upgrade

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