Thanks, Joseph. The 3.6 kernel didn't fix the problem for me.

$uname -a
Linux umang-laptop 3.6.0-030600rc1-generic #201208022056 SMP Fri Aug 3 01:04:00 
UTC 2012 i686 i686 i386 GNU/Linux

In addition to being a little slower to boot, the kernel also may have
done something to the hardware. After the 3.6 kernel froze, I forced the
laptop to power off by holding the power button (like I normally do when
it hangs) and I could smell something odd coming from my laptop. I
booted  back into the 3.2 kernel immediately and within five minutes the
smell seemed to have abated.

For future reference, is there anything I can do to shutdown in
situation like these without forcing a power off?

I hope this helps debug the issue. It has been particularly painful
recently.

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https://bugs.launchpad.net/bugs/1007765

Title:
  brightness adjusting crashes system

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