Comment 3 for bug 320771
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0e1f616
(Get the code!)
I have exactly the same issue here.
To me it appears that this issue only appears on the second display and it mostly takes some time until this issue appears. At least for me from the beginning all things are fine.
I sometimes use KDE4 or XFCE using Ubuntu 8.10 and when using XFCE it appears within minutes whereas in KDE it take several hours of work until the corruption appears.
All methods to get that corrupted mouse pointer captured failed and in framebuffer mode it doesn't seem to appear, so it is likely to be a problem in the driver.
In addition to the corruptions that Alex mentioned I have an additional corruption with the mouse pointer itself. When I see that corruption the cursor can sometimes be corrected by moving the mouse into the first display and back again.
I'm using a RV515 (ATI Radeon X1300) although the driver complains in the Xorg.0.log that DRI may not work correctly for R600 cards. (???)