Comment 9 for bug 911591

@James

Please, dont revive a deadly report, its useless and spamming the report with different data. That is not the best way to catch dev attention.
As you can see, that report have not got a single dev question or answer; do you mind why ?

If you still have that problem, then confirm it still exist on a fresh recent install (not on a system that got many dist-upgrades, and polluted with old borked settings. As you are using a nvidia driver, either follow the #8 link's comment about adding nvidia parameters in such a case, or confirm when using 'nouveau' instead. In both cases, install the dev packages to get a usefull report using ubuntu-bug.