This bug was fixed in the package kde-workspace - 4:4.9.97-0ubuntu2
--------------- kde-workspace (4:4.9.97-0ubuntu2) raring; urgency=low
* Add kubuntu_revert_285553e.diff to revert upstream commit 285553edce61f65a88d9067136bf138e44efb149 as it causes brightness flickering on some systems (LP: #1088150) -- Philip Muskovac <email address hidden> Sun, 06 Jan 2013 01:01:01 +0100
This bug was fixed in the package kde-workspace - 4:4.9.97-0ubuntu2
---------------
kde-workspace (4:4.9.97-0ubuntu2) raring; urgency=low
* Add kubuntu_ revert_ 285553e. diff to revert upstream commit 1f65a88d9067136 bf138e44efb149 as it causes brightness
285553edce6
flickering on some systems (LP: #1088150)
-- Philip Muskovac <email address hidden> Sun, 06 Jan 2013 01:01:01 +0100