Since the last update my login screen is suddenly extended over two displays which is annyoing since I have to somehow scroll with the mouse to move the login prompt into the view. I feels like the login screen is as big as both of my screens together.I guess the last update screwed the monitor settings and the login is a side effect (it was a kernel update and it screwed my network settings as well!). There are suddenly 3 monitors in display settings. In Nvidia config, "X screen 0" is a container for both monitors. I'm not sure if this was before and somehow I think that gdm uses this "X screen 0" as default.
But in display config, I have an additional monitor 1 "Unknown Display" and when I activate is, it is as big as my big monitor.
The real monitors start with number 2 and 3. I guess this leads to this weird behaviour on the login page. I cannot even remove this "Unknown Display". Any ideas what I can do?