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you might want to check my last post in:
http://ubuntuforums.org/showthread.php?t=2216720

I changed my xorg.conf and use intel driver now it can run optimized.


~$ cat /etc/X11/xorg.conf
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
EndSection

Section "Monitor"

I am using lenovo G-4)0 with Radeon HD 8570A/8570M
While waiting for the bugfix https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1301839 here is what I did:

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