This issue reproduced on 201107-8258 Lenovo E525 Driver version xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629 xserver-xorg-video-radeon 1:6.14.99~git20111219.aacbd629
It could be reproduced when you try to set the resolution to 800*600
This issue reproduced on 201107-8258 Lenovo E525 xorg-video- ati 1:6.14. 99~git20111219. aacbd629 xorg-video- radeon 1:6.14. 99~git20111219. aacbd629
Driver version
xserver-
xserver-
It could be reproduced when you try to set the resolution to 800*600