If you're using the NVIDIA proprietary driver then the primary monitor (the one the launcher appears on) is chosen by the "TwinViewXineramaInfoOrder" option in /etc/X11/xorg.conf, which I think you change by ticking the primary monitor box in the NVIDIA control panel.
Using the NVIDIA proprietary driver, xrandr and the Gnome Displays control panel are totally irrelevant. Thanks NVIDIA :P
If you're using the NVIDIA proprietary driver then the primary monitor (the one the launcher appears on) is chosen by the "TwinViewXinera maInfoOrder" option in /etc/X11/xorg.conf, which I think you change by ticking the primary monitor box in the NVIDIA control panel.
Using the NVIDIA proprietary driver, xrandr and the Gnome Displays control panel are totally irrelevant. Thanks NVIDIA :P