Apparently power management support for Radeon cards was implemented to
the graphics stack in the 2.6.35 kernel.

http://kernelnewbies.org/Linux_2_6_35#head-
c499f95459056037b9734458baaf2719a0067ee4

-- 
System freezes when running on battery
https://bugs.launchpad.net/bugs/662998
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which is subscribed to xserver-xorg-video-ati in ubuntu.

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