I'm trying the command xrandr --setmonitor Eyefinity auto "DisplayPort, DVI-D-0"
This is my output
output list DisplayPort, DVI-D-0 add monitor DisplayPort output name DisplayPort add monitor DVI-D-0 output name DVI-D-0 xrandr: cannot find output
I'm not sure if it matters, but I normally see that command used without quotation marks around the outputs and without a space after the comma between outputs, ie something like:
xrandr --setmonitor Eyefinity auto DisplayPort,DVI-D-0