How can I set the resolution of gdm

Support GNOME
,
1

How to set resolution of the login screen gnome; (UHD-Monitor (3840x2160))
this does not work any longer:
.
Change resolution of desktop to desired resolution.
sudo cp -i .config/monitors.xml /var/lib/gdm/.config/
sudo chown gdm:gdm /var/lib/gdm/.config/monitors.xml
Change back resolution of desktop to “normal” resolution.

2

You can try to save “xorg.conf” in:
sudo cp xorg.conf /etc/X11/xorg.conf.d/80-something.conf

3

… Found no xorg.conf in my Gnome…
($HOME)