This bug seems to be a bad interaction between lightdm and fglrx. I switched to GDM and now the problem does not happen anymore.
** Also affects: lightdm Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to fglrx-installer in Ubuntu. https://bugs.launchpad.net/bugs/1067320 Title: 1002:6798 [fglrx] VT cursor is visible and blinking on top of Unity Radeon HD 7970 and 5450 To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/1067320/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp