I've a Debian system with xfce on a laptop. I tried to invert my monitor with the the desktop tool. After I had applied the settings, the screen shut off. Then the start up screen with the log in appears. When I try to log in, the monitor shuts off and the log in appears.
I'm stack in a loop. Only the terminal(secure) mode runs.
I need to reset the monitor settings on the terminal.
I tried a little bit with the xrandr command but nothing worked.
The problem was solved like in this thread
Thanks, Good night