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.