Comment 12 for bug 163044

Forwarding this bug from Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/163044

"When using Evince or Adobe Reader 8 to read PDF files, "Alt+Tab" to gnome-terminal, by chance of 1/10 I can find display error in terminal. The error is like this: a rectangular area of terminal is covered by one block of the pdf file or some other applications, and the position of the error area is exactly where the block is displayed. It's never found when evince and adobe reader 8 are both closed.

For example, evince is opened, "man find" in terminal, press "f" or "b" to turn pagedown or pageup, the error appears, not every page, but sometimes, by chance of about 1 in 10. When press "j" to scroll down, the display return to normal."

http://launchpadlibrarian.net/10436857/Screenshot1.png
http://launchpadlibrarian.net/13834985/Xorg.0.log