https://bugs.freedesktop.org/show_bug.cgi?id=46866
--- Comment #5 from Christopher M. Penalver christopher.m.penalver@gmail.com --- samit vats, Ubuntu 11.10 reached EOL on May 9, 2013. For more on this, please see https://wiki.ubuntu.com/Releases .
If this is reproducible on a supported release, it will help immensely if you filed a new report with Ubuntu by ensuring you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information running the following from a terminal: ubuntu-bug xorg
Also, please feel free to subscribe me to it.
For more on why this is helpful, please see https://wiki.ubuntu.com/ReportingBugs.