@karsten13 Hello,
I’ve given up. I’ve tried the following.
I created a new image, currently only available for the Rock-F2.
A Debian Bullseye Desktop LXDM display manager (Debian Xfce) without an X server.
I’m currently using an RPi 3 again, and I’ve managed to get everything working.
Thanks very much for your support.
Olaf