GNOME Display Manager

GNOME Display Manager (GDM) is a display manager (a graphical login manager) for the windowing systems X11 and Wayland. The X Window System by default uses the XDM display manager. However, resolving XDM configuration issues typically involves editing a configuration file. GDM allows users to customize or troubleshoot settings without having to resort to a command line. Users can pick their session type on a per-login basis. GDM 2.38.0 is the last version that features customization with themes; subsequent releases do not support themes. Software architecture GDM is a display manager that implements all significant features required for managing attached and remote displays. GDM was written from scratch and does not contain any XDM or X Consortium code. Components GDM comprises the following components: Chooser – a program used to select a remote host as the source for a remote display on the attached display (gdm-host-chooser) Greeter – the graphical login window (provided by GNOME Shell) Pluggable authentication module (PAM) X Display Manager Control Protocol (XDMCP)