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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.

Nvidia settings and display settings

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. unknown display

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?

Bevor
  • 598

1 Answers1

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I found a workaround which is acceptable for me. When you execute xrandr you see the name of the phantom monitor. For me it was None-1-1.

Now create a file with the following content:

/etc/X11/xorg.conf.d/disable-ghost-monitor.conf 
Section "Monitor"
    Identifier "None-1-1"
    Option "Ignore" "true"
EndSection

After reboot, GDM ignores this phantom monitor and the GDM prompt is properly aligned again. In display settings, the phantom monitor is also gone... corrent display settings

Bevor
  • 598