Thanks for the response. As if by magic it did it again today. I killed off chrome and virtualbox with no response. Killed off the screensaver with again no change. Compiz and X just sat at 100% cpu and zero response to the mouse/keyboard on the screen.
I don't tend to run much, lots of gnome-terminal's, firefox, opera, chrome and virtualbox are pretty much all that's ever running. I'm not sure if it is the same issue or not but I found this: http://www.nvnews.net/vbulletin/showthread.php?t=162243 Which at least partly matches both the hardware (multi nvidia GPU, multi-monitor), Ubuntu and behaviour but I can't trigger it with the script the OP has posted. For reference I'm using Nvidia driver version: 260.19.06 I can/will run anything required to try and tie down the issue further. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/780424 Title: Xorg unresponsive after screensaver unlock with Dual Head To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/780424/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs