Problem seems to be solved with Dell Optiplex 745 after latest upgrade to driver version 2:2.2.1-1ubuntu13.3.
-- Hard lock booting/logging out/restarting [Q965] https://bugs.launchpad.net/bugs/220135 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs