Display a text banner on the login screen

You can display extra text on the login screen, such as who to contact for support, by setting the org.gnome.login-screen.banner-message-enable and org.gnome.login-screen.banner-message-text GSettings keys.

Display a text banner on the login screen:

  1. Create the gdm profile which contains the following lines:

    /etc/dconf/profile/gdm

    user-db:user
system-db:gdm
file-db:/usr/share/gdm/greeter-dconf-defaults

    gdm is the name of a dconf database.

  2. Create a gdm keyfile for machine-wide settings in /etc/dconf/db/gdm.d/01-banner-message:

    [org/gnome/login-screen]
banner-message-enable=true
banner-message-text='Type the banner message here.'

  3. Update the system databases:

    # dconf update

There is no character limit for the banner message. gnome-shell autodetects longer stretches of text and enters two column mode.

The banner message cannot be read from an external file.