gdm: gdm (GNOME Display Manager) gdm: gdm: GDM (the GNOME Display Manager) provides an alternate display manager gdm: for the X Window System. The X Window System by default uses the XDM gdm: display manager. However, resolving XDM configuration issues typically gdm: involves editing a configuration file. GDM allows users to customize gdm: or troubleshoot settings without having to resort to a command line. gdm: Users can pick their session type on a per-login basis. GDM also gdm: features easy customisation with themes. gdm: gdm: