I notice that your monitor is connected via DisplayPort. There were
some DisplayPort fixes in the upstream 3.14 kernel. A PPA of the
3.14.12 kernel is available at http://kernel.ubuntu.com/~kernel-
ppa/mainline/ and instructions on how to install and uninstall it are
available at https://wiki.ubuntu.com/Kernel/MainlineBuilds
Can you please try this updated kernel and report the results here?
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1328026
Title:
Screen corruption on rotate (Unity, radeon)
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