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
Marking as Won't Fix, as the system works with the proprietary driver
** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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Title:
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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Title:
Unable to change brightness at all
To manage notifications about this b
Looks like this is radeon driver issue. Could you install fglrx and try
again?
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/113417