Christopher M. Penalver, thanks for your clear instructions.
I tested with linux-image-3.12.0-031200rc6-generic, and this problem persists.
I also found that when booting the machine, I can adjust the brightness when 
GRUB2 is loaded, and then when I boot into Ubuntu, I'm stuck at whatever 
brightness level I had in GRUB2.

Good hunting, and thanks!
I'll be happy to offer any more information you might need.

** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream 
kernel-bug-exists-upstream-3.12.0-031200rc6

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1178727

Title:
  8086:0046 Screen brightness can not be adjusted in Raring with Intel
  Ironlake graphics

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