Getting this to work has been the bane of my morning, so here's what I did to eventually get it working: Edit /etc/bumblebee/bumblebee.conf (as root). Change: Edit /etc/bumblebee/xorg.conf.nvidia (as root). Change: Option "ConnectedMonitor" "DFP" to Option "ConnectedMonitor" "CRT" A reboot now should enable you to do: "optirun glxgears" without any problems. If it isn't working, make sure that bumblebee-nvidia is actually installed.