Matthias Clasen
matthias.clasen@gmail.com 2012
Michael Hill
mdhillca@gmail.com 2012
Ekaterina Gerasimova
kittykat3756@gmail.com 2013
Petr Kovar
pknbe@volny.cz 2013
Edit a GDM dconf profile to display an image on the login screen.
Fran Diéguez
frandieguez@gnome.org 2010-2017

# Add a greeter logo to the login screen

The greeter logo on the login screen is controlled by the org.gnome.login-screen.logo

GSettings key. Since GDM uses its own dconf profile, you can add a greeter logo by changing the settings in that profile.

When choosing an appropriate picture for the logo to your login screen, consider the following picture requirements:

All the major formats are supported: ANI, BPM, GIF, ICNS, ICO, JPEG, JPEG 2000, PCX, PNM, PBM, PGM, PPM, GTIFF, RAS, TGA, TIFF, XBM, WBMP, XPM, and SVG.

The size of the picture scales proportionally to the height of 48 pixels. So, if you set the logo to 1920x1080, for example, it changes into an 85x48 thumbnail of the original picture.

# Set the org.gnome.login-screen.logo key

Create a gdm database for machine-wide settings in /etc/dconf/db/gdm.d/01-logo:

[org/gnome/login-screen] logo='/usr/share/pixmaps/logo/greeter-logo.png'

Replace /usr/share/pixmaps/logo/greeter-logo.png with the path to the image file you want to use as the greeter logo.

# What if the logo does not update?

Make sure that you have run the dconf update command to update the system databases.

In case the logo does not update, try restarting GDM.