I suffer the same problem too, adjusting the brightness via settings or
keyboard doesn't actually affect screen brightness, and when it lowers
brightness due to inactivity  the screen flashes scaringly. Same
hardware: Dell XPS13 developer edition w/ native ubuntu (upgraded to
13.04 and up-to-date).

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https://bugs.launchpad.net/bugs/1183942

Title:
  Cannot adjust screen brightness in DELL XPS 13

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