Alt+Ctrl+F2 doesn’t work. I didn’t try to change to GDM.
That being sai I found a solution. Both Xubuntu and manjaro work trough hdmi (I was using displayport).
For my monitor hdmi and displayport offer the same image quality , so changes to HDMI is an option. (because I have all may cable hidden, it will take some effort to reroute everything, but it is an option).
I will also try GDM, thanks for the help.