use the proprietary driver in comment4 to clean out this bug:
dumping information by "dpkg -l | grep fglrx":
ii fglrx-amdcccle-experimental-13 2:13.101-0ubuntu0.0.2
Catalyst Control Center for the AMD graphics accelerators
ii fglrx-experimental-13 2:13.101-0ubuntu0.0.2
Video driver for the AMD graphics accelerators
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https://bugs.launchpad.net/bugs/1134172
Title:
Unable to change brightness at all
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