The reason why it doesn't automatically recognize it is that you're using the NVIDIA proprietary driver, which needs further configuration to enable dualhead.
** Package changed: xserver-xorg-video-nv (Ubuntu) => nvidia-graphics- drivers (Ubuntu) ** Changed in: nvidia-graphics-drivers (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/394006 Title: external display not recognized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/394006/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs