GDM Scaling

September 21, 2022

Using Gnome/GDM with large HiDPI displays (like a television) is great, except GDM is by default scaled at 1.0. It’s possible to change the scaling of GDM through modification of /var/lib/gdm/.config/monitors.xml. This file may not exist, so you can modify your display via the Gnome GUI, then copy that configuration over (assuming Fedora Silverblue, you’re going to want to target /var so it persists):

sudo cp /var/home//.config/monitors.xml /var/lib/gdm/.config/

The main thing you’re looking for in the configuration file is the expression of scale: <scale>2</scale>.

There is also a new tool called Login Manager Settings that has some features for graphically changing the GDM experience.