Ah, sso I think this bug and bug 619397 are actually duplicates. When
you remove the power cable, then gnome-power-manager tries to adjust the
screen brightness.

So this looks like a bug in the ATI kernel DRM driver. Do you get the
freeze if you do this?

  echo 3 | sudo tee /sys/class/backlight/*/brightness

Please also give me the output of

  ls -l /sys/class/backlight/

for completeness.

-- 
Computer freeze when removing power cable
https://bugs.launchpad.net/bugs/615803
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