Comment 2 for bug 1514102

Ian Bruntlett, thank you for reporting this and helping make Ubuntu better.

Could you please run the following command from a terminal as it will automatically gather and attach updated debug information to this report:
apport-collect -p xorg 1514102

Please ensure you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

When reporting xorg related bugs in the future, please do so via the above method. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.