I have an nvidia card & I'm using xserver. When I connect a single monitor it works fine. When I connect a second monitor after already on desktop, it does not display in monitor settings. When I have both connected during boot, I get black screen after.
$ xrandr -d :0 --auto has no effect. Here's my output:
$ xrandr -d :0 Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192 DVI-I-1 disconnected (normal left inverted right x axis y axis) DVI-I-2 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm 1280x1024 60.02*+ 75.02 1152x864 75.00 1024x768 75.08 60.00 800x600 75.00 60.32 640x480 75.00 60.00 720x400 70.08