Btw, there is no support for mixed gpu types, its one of my features I will add next but it will take my a few weeks. Requires deepest possible changes.

The display of the individual gpu types isnt real, its just preparation.

Still, that has nothing to do with the X11 stuff. You need to disable it completly, gdm, xdm, kdm, whatever you are running, its must be stopped fully otherwise it will not work (thanks to AMD).