I've flashed the BIOS update via FreeDOS live cd and I'm currently on
version A10, release date 08/28/2013. At first, it did not look as if it
had done anything to fix the problem. Brightness control was still not
working.

However, I noticed a recent comment
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/954661/comments/108)
that suggested changing the option of Load Legacy Option Rom to Enabled
from the BIOS setup menu. I also removed all options from
GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub so it was an empty
string. Now it appears that with kernel 3.8.0-33-generic I have
brightness control working again.

I'm not entirely sure if it was indeed the BIOS update or the
/etc/default/grub + BIOS setup menu change that ended up correction the
situation, but I'll see if I can pinpoint which one did the trick.

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https://bugs.launchpad.net/bugs/1232459

Title:
  [Dell XPS 13 L322X] Brightness control broken on Raring 13.04 after
  kernel upgrade

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