I could set the screen resolution to correct resolution. The option is available only when
some devices are connected.
Tnx for help.
I started Firefox, DNF (Yumex) and a terminal in Gnome, but system froze, I tried to
connect by sshd, but no connection was available. I had to reset by hard reboot....
In another session using LXDE, DNF froze the system, and also setting froze the system...