Hello, this bug is probably known, but I can't find it. See description at http://ubuntuforums.org/showthread.php?t=1322912 http://ubuntuforums.org/showthread.php?t=1285406 The problem appears by me on Ubuntu 9.10, Fedora 12. In older releases was no such bug.
Please attach your xorg log and config.
Created attachment 31437 [details] xorg.conf - I think nothing special
Created attachment 31438 [details] [review] appropriate Xorg.0.log - all Ubuntu 9.10
Fortunately - someone has found workaround: The problem disappears with driver option: Option "RenderAccel" "false" see: http://ubuntuforums.org/showthread.php?t=1285406&page=5
*** This bug has been marked as a duplicate of bug 22055 ***
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