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 -- radeonhd driver does not support changing panel brightness https://bugs.launchpad.net/bugs/214909 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs