Sane bug here.
I'm using the XPS 13 (Sandy Bridge).
Ubuntu 13.04 (3.8.0-16-generic)
Using "/bin/echo 0 > /sys/class/backlight/intel_backlight/brightness" fixes the 
issue.
Perhaps there's a rollback?

Regards

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https://bugs.launchpad.net/bugs/954661

Title:
  backlight brightness not adjustable by default on Dell XPS 13

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