seems this bug a duplicate of #LP 132716
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/132716
and others can be duplacate too of #LP 132716 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/134578 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/134467 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/117440
seems this bug a duplicate of #LP 132716
https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- ati/+bug/ 132716
and others can be duplacate too of #LP 132716 /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- ati/+bug/ 134578 /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- ati/+bug/ 134467 /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- ati/+bug/ 117440
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