XDM

XDM provides a simple and straightforward graphical login prompt.

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."

Installation

Install the xorg-xdm package. Then enable xdm.service.

If you would like to use an Arch Linux theme for XDM, you can optionally install the xdm-archlinux package. If installing the latter package, then do not enable xdm.service, but instead enable xdm-archlinux.service.

Configuration

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 file should look like this:

startxfce4

Ensure that the .xsession file in your home directory is executable.

Theming

For the exact meanings of the options discussed below, see . The configuration file is located in , notice that if you installed xdm-archlinux the configuration file will instead be located in .

Background wallpaper

Install qiv.

Create a directory to put wallpapers in, e.g /usr/local/share/backgrounds and then place them inside it.

Edit . Change the xconsole command to

Font

Edit . 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

Passwordless login

In order to enable passwordless login for XDM, add the line below to :

xlogin*allowNullPasswd: true

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