I have this problem. I found I can get the login screen back if I Ctrl+Alt+Backspace.
How did you come to the conclusion to use those commands? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1500925 Title: Ubuntu 15.10 Idle freezing/screen not waking up To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1500925/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs