Paul Scott <waterhorse@ultrasw.com> writes: > On 07/01/2011 02:25 PM, Claudius Hubig wrote: >> Paul Scott<waterhorse@ultrasw.com> wrote: >> xrandr >> >> output? Is your monitor correctly listed? What happens when you try > > (after stopping gdm3) I get "can't open display" You need to run xrandr in an X session. Have you tried to run nvidia-settings? It can display some information about your monitor.