GDM should use the same monitor refresh rate as I set in GNOME Settings
GDM always uses a 60 Hz refresh rate on both of my 144 Hz monitors, even though I have them set up to 144 Hz in GNOME Settings. This is presumably because 60 Hz is the default value (why? it should default to the highest refresh rate imo).
Monitors: Dell S2716DG (2560×1440, 144 Hz), ASUS VG248QE (1920×1080, 144 Hz).
Fedora 31, GDM 3.34.1-1.fc31, gnome-shell 3.34.4-1.fc31, gnome-settings-daemon 3.34.2-1.fc31, mutter 3.34.4-1.fc31.