Go to System Settings -> Displays -> Sticky edges Here I saw that sticky edges was turned "On". Once I turned it "Off" and clicked "Apply", the issue disappeared. Again, this is not an Nvidia issue, as I have the issue with no discrete graphics card at all.
** Package changed: nvidia-graphics-drivers (Ubuntu) => gnome-control- center (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/990904 Title: Dual monitor problem after upgrade to 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/990904/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs