According to https://wiki.ubuntu.com/Bugs/FindRightPackage the gnome- power-manager package is most likely to cause the bug.
** Package changed: ubuntu => gnome-power-manager (Ubuntu) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/998735 Title: Light blue screen on primary monitor when waking up from inactivity Status in “gnome-power-manager” package in Ubuntu: New Bug description: I have configured ubuntu to turn of screen after 10 minutes of inactivity. When I wake up computer the external primary screen is light blue and the laptop-screen is black and displaying my usename at the top right corner. I use Ubuntu 12.04 with propitary Nvidia drivers. I also use GDM and gnome-shell (Gnome 3). I use a external monitor as primary screen and laptop-screen as secondary. Both resolution is 1920x1200. Laptop is Dell XPS M1530. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/998735/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
