Did someone tryed this solution : 
http://www.webupd8.org/2012/08/fix-dell-xps-13-backlight-brightness.html ?
Maybe this works (can't try, I'm under 11.04)

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https://bugs.launchpad.net/bugs/818826

Title:
  backlight brightness control won't work in 2011 iMac 27"

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