In order to disable XINERAMA, we can either:

  - pass xinerama=0 as an nx/nx option
  - pass -xinerama AND -rrxinerama to x2goagent/nxagent as a normal option

Merely passing -rrxinerama will only disable the Randr-XINERAMA part, but the
PanoramiX-XINERAMA implementation will stay enabled.

Also see
https://github.com/ArcticaProject/nx-libs/blob/3.6.x/nx-X11/programs/Xserver/hw/nxagent/man/nxagent.1
for more information.

Older nxagent versions do not support the xinerama nx/nx option or the
-rrxinerama switch.


Mihai