GDM3.8(8)                                                 Debian GNU/Linux                                                GDM3.8(8)

       gdm3 - GNOME Display Manager


       gdm3 is the equivalent of xdm(1x) or wdm(1x), but uses the GNOME libraries to provide a GNOME look-and-feel. It provides the
       GNOME equivalent of a "login:" prompt.

       gdm3 reads /etc/gdm3/custom.conf for its configuration. For each local display, gdm starts an X server and runs a minimal
       GNOME session including a graphical greeter. If configured so, the main gdm process also listens for XDMCP requests from
       remote displays. These requests can either be direct, causing gdm3 to start a session on the remote display, or indirect,
       causing a chooser to be opened.

       When managing a display, gdm3 attempts to execute /etc/gdm3/Init/display, or /etc/gdm3/Init/Default if that does not exist.
       When a user logs in, gdm3 first attempts /etc/gdm3/PreSession/display (or /etc/gdm3/PreSession/Default), and then one of the
       sessions defined in /usr/share/xsessions. When the session has completed, gdm attempts to run /etc/gdm3/PostSession/display,
       or /etc/gdm3/PostSession/Default.

       gdm3 maintains information about the displays it is managing in /var/lib/gdm3. This includes xauth information, so this
       directory is not readable to normal users.

       gdm3 uses PAM to perform authentication using the config file /etc/pam.d/gdm3.

           Upon session startup, GDM sets the XAUTHORITY environment variable to a session-specific file in /run/gdm3.

           Applications and scripts that assume this file is set to ~/.Xauthority will not work. To access the display you need
           both DISPLAY and XAUTHORITY variables.

       Martin Kasper Petersen <>

       This manual page written by Steve Haslam <> for Debian GNU/Linux. Updated by Raphaeel Hertzog
       <>, Ryan Murray <>, Josselin Mouette <> and Vincent Lefevre

GNOME 44.0-1ubuntu2                                          2023-06-01                                                   GDM3.8(8)