I also tried the suggested workaround from comment #50 (with the Trusty kernel) and ran into the same problem. This time after screen locked, I had black external monitor, working laptop screen but without the login prompt, and no recognised keyboard input - I.e,. I couldn't event ctrl- alt-F1 to get to login prompt. I'll attach the logs below just in case they help.
** Attachment added: "dmesg" https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1315369/+attachment/4135488/+files/dmesg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1315369 Title: Log in not available after lock screen with multi-monitor To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1315369/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
