I just installed a fresh install of 13.10 on this machine, and the problem 
persisted. However,  changing my GRUB settings to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX="acpi_osi=Linux"
now allows me to adjust the brightness, although at boot, it's set to 0. (I'll 
look into that problem seperately).
Is there any reason I should not use acpi_osi=Linux? I've read it could have 
ill effect, namely on the fans. Can I test this somehow?

Does this information help in somehow fixing this problem for other
users?

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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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