On Sun, Jul 24, 2022 at 5:27 PM Patrick Dupre <pdupre@gmx.com> wrote:
What I am doing is simple.

I boot.
I get the graphical environment/display offering the user list (X).
Now 2 options
1) I login "normally" bu providing a password.
After that, the graphic freezes for a small while (1-2 Minute),
and I can try the same thing, wit the same result.

Does the login user have a VNC server running?   If I connect
a monitor to a normally headless server something similar
happens.  VNC servers are being started using systemd.
 
Only one solution: reboot (for example by login from the network).
2) Ctl/Atl F2. I get a text terminal and I log in text mode
I run startx and the X mode opens, every thing run properly
(gnome).
Do you
Is it clear?

I haven't tried that -- just use the text terminal to stop the VNC
server.