- Xdm manages a collection of X displays, which may be on the local host or remote servers. The design of xdm was guided by the needs of X terminals as well as The Open Group standard XDMCP, the X Display Manager Control Protocol. Xdm provides services similar to those provided by init, getty and login on character terminals: prompting for login name and password, authenticating the user, and running a "session."
XDM provides a simple and straightforward graphical login prompt.
If you would like to use an Arch Linux theme for XDM, you can optionally install the
xdm.service, but instead enable
Defining the session
Unlike many more modern display managers such as GDM or LightDM, XDM does not source available sessions from .desktop files located in the
/usr/share/xsessions directory. As such, XDM does not have a 'session menu.' Instead, XDM will execute the
.xsession file in the home directory.
For example, to start Xfce upon login, the
~/.xsession file should look like this:
Ensure that the
.xsession file in your home directory is executable.
For the exact meanings of the options discussed below, see
/etc/X11/xdm/Xresources, notice that if you installed the configuration file will instead be located in
Create a directory to put wallpapers in, e.g
/usr/local/share/backgrounds and then place them inside it.
/etc/X11/xdm/Xsetup_0. Change the
xconsole command to
/usr/bin/qiv -zr /usr/local/share/backgrounds/*
/etc/X11/xdm/Xresources. Add/replace the following defines:
xlogin*greetFont: -adobe-helvetica-bold-o-normal--20------iso8859-1 xlogin*font: -adobe-helvetica-medium-r-normal--14------iso8859-1 xlogin*promptFont: -adobe-helvetica-bold-r-normal--14------iso8859-1 xlogin*failFont: -adobe-helvetica-bold-r-normal--14------iso8859-1
Login dialog positioning
This configuration will move the login dialog to the bottom right of the screen.
xlogin*frameWidth: 1 xlogin*innerFramesWidth: 1 xlogin*logoPadding: 0 xlogin*geometry: 300x175-0-0
Removing the logo
Comment out the logo defines:
#xlogin*logoFileName: /usr/share/xdm/pixmaps/xorg.xpm #xlogin*logoFileName: /usr/share/xdm/pixmaps/xorg-bw.xpm
Multiple X sessions & Login in the window
With the XDMCP enabled, you can easily connect to local or remote XDM instance and run multiple X sessions simultaneously on the same machine:
# X -query xdmcp-server-ip :2
This command will launch the second session in window using Xephyr:
$ Xephyr -query xdmcp-server-ip :2
In order to enable passwordless login for XDM, add the line below to