I've managed to get this bug solved!
The answer is here:
http://ubuntuforums.org/showthread.php?t=2181534&p=12819813#post12819813
Create the file /usr/share/X11/xorg.conf.d/20-intel.conf with the
following content:
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
Log out to see if it works.
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which is subscribed to fglrx-installer in Ubuntu.
https://bugs.launchpad.net/bugs/1007765
Title:
brightness adjusting crashes system
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