Hello I am sorry that I am only now again announce private to do a lot.
I'll take a closer look at my problem and get an Odroid h2 and Batocera up and running.
Everything is going great so far, I just want to build it into a small case so I can not use a splitter.
If I try the contribution of gnubit-au so xrandr I always get only the output Can not open display because I'm not moving on.
I try to operate on the Odroid h2 HDMI output an internal display that goes all so far and on the display port 1.2, I have an HDMI adapter and would like to just connect a TV. But if I do that I will not get any pictures on both monitors.
Does anyone know where this is, or have I made a mistake?