As I said here https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/194214/comments/41 , the bug occured for me since my upgrade to Gutsy, which uses xserver-xorg-core 2:1.3.0.0.dfsg-12ubuntu8.3 ...
As I said here https:/ /bugs.launchpad .net/ubuntu/ +source/ xorg-server/ +bug/194214/ comments/ 41 , 0.dfsg- 12ubuntu8. 3 ...
the bug occured for me since my upgrade to Gutsy, which uses xserver-xorg-core 2:1.3.0.