Interesting that I read your post about the same time as I also saw this bug highlighted - https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/565981
I don't think its the same as the symptoms seem totally different but it is certainly in the same area so it could possibly be related.
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I don't think its the same as the symptoms seem totally different but it is certainly in the same area so it could possibly be related.