http://www.x.org/wiki/radeonhd#head-
d0cfd39d1b149a43f0c1d862f21f4b3ddcb43ae2 says that this is a known
limitation, affecting any laptop using radeonhd. Until it's implemented
upstream, you can set brightness by switching to a non-X vt (ctrl-alt-1,
for example), setting the brightness, then switching back to X.

** Changed in: xserver-xorg-video-radeonhd (Ubuntu)
       Status: New => Confirmed

** Summary changed:

- radeonhd driver does not support changing brightness on T60p
+ radeonhd driver does not support changing panel brightness

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radeonhd driver does not support changing panel brightness
https://bugs.launchpad.net/bugs/214909
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