This bug affects me too:

Linux dell 3.5.0-21-generic #32-Ubuntu SMP Tue Dec 11 18:51:59 UTC 2012 x86_64 
x86_64 x86_64 GNU/Linux
dell studio 1558

After months of hating ubuntu on this machine:
This bug is FIXED for me by adding these kernel options:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force
acpi_backlight=vendor"

changed in/with:
$sudo nano /etc/default/grub
$sudo update-grub
$sudo reboot

Thought I share this...

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

Title:
  brightness adjusting crashes system

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