# XDM

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- Display manager

From XDM manual page:

  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.

## 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 `~/.xsession` should look like this

    startxfce4

Ensure that the `.xsession` file in your home directory is executable. To do this use the following command:

    $ chmod 700 ~/.xsession

### Theming

For the exact meanings of the options discussed below, see the manual page of xdm. The configuration file is located in `/etc/X11/xdm/Xresources`, notice that if you installed xdm-archlinux the configuration file will instead be located in `/etc/X11/xdm/archlinux/Xresources`.

#### Background wallpaper

You can use a program such as qiv to set the background in XDM:

- Install qiv

- Make a directory to store background images, e.g. `/root/backgrounds` or `/usr/local/share/backgrounds`

- Place your images in the directory.

- Edit `/etc/X11/xdm/Xsetup_0`. Change the `xconsole` command to:

     /usr/bin/qiv -zr /root/backgrounds/*

#### Font

- Edit `/etc/X11/xdm/Xresources`. Add/replace the following defines:

     xlogingreetFont:  -adobe-helvetica-bold-o-normal--20------iso8859-1
     xloginfont:       -adobe-helvetica-medium-r-normal--14------iso8859-1
     xloginpromptFont: -adobe-helvetica-bold-r-normal--14------iso8859-1
     xloginfailFont:   -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 enable, you can easily run multiple X sessions simultaneously on the same machine.

    # X -query ip_xdmcp_server :2

This will launch the second session, in window you need xorg-server-xephyr

    # Xephyr -query this_machine_ip :2

### Passwordless login

In order to enable passwordless login for XDM, add the line below to `/etc/X11/xdm/Xresources`:

    xlogin*allowNullPasswd: true

Category:

- Display managers