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# XDM

From ArchWiki

Summary
XDM is the X Display Manager.
Related
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 xorg-xdm, available in the official repositories.

Use default launch script `~/.xsession`. Make the `~/.xsession` file executable.

    $ cp /etc/skel/.xsession /etc/skel/.xinitrc ~  # use default launch script

Or use a simple line (assume your favorite window manager is 'openbox')

    $ echo exec openbox > ~/.xsession
    $ chmod 744 ~/.xsession

Without these modifications XDM will execute the `xinitrc` from `/etc/X11/xinit/xinitrc` (See Xorg#Running for details).

If you would also like to use an Arch Linux theme for XDM, you can optionally install the xdm-archlinux package, also available in the Official Repositories.

See Display Manager for additional information.

## Background wallpaper

Here are some tips to make XDM look nicer:

- Install qiv

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

- Place your images in the directory. If you do not have any try [1] for starters

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

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

- 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
     xlogin*frameWidth: 1
     xlogin*innerFramesWidth: 1
     xlogin*logoPadding: 0
     xlogin*geometry:    300x175-0-0

Comment out the logo defines:

     #xlogin*logoFileName: /usr/X11R6/lib/X11/xdm/pixmaps/xorg.xpm
     #xlogin*logoFileName: /usr/X11R6/lib/X11/xdm/pixmaps/xorg-bw.xpm

For the exact meaning of the definitions, see the man page of xdm

- Update `/etc/pacman.conf` so the changes do not get erased:

     ~NoUpgrade   = etc/X11/xdm/Xsetup_0 etc/X11/xdm/Xresources

The changes will now give you a random wallpaper image and move the login prompt to the bottom-right edge of the screen.

## 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

## Troubleshooting

### XDM loops back to itself after login

The current version of the xorg-xdm package, available in the official repositories is patched to register sessions with ConsoleKit by default. If ConsoleKit is not running, XDM will fail to succesfully launch an X session. D-Bus can be used invoke ConsoleKit when called upon by XDM.

Make sure that the dbus package, available in the official repositories is installed.

When using pure systemd with logind, instead of consolekit which is now deprecated, systemd will start dbus automatically. To launch xdm use:

    # systemctl enable xdm.service

or:

    # systemctl enable xdm-archlinux.service

Also, make sure that you are actually starting your window manager, for example with the command `xmonad` in `~/.xsession`, and that `~/.xsession` has the correct permissions of `774`. This file is installed by xorg-xinit.

### XDM does not update login records

The vanilla config of XDM calls `/etc/X11/xdm/GiveConsole` for the startup of display :0, whereas otherwise it calls `/etc/X11/xdm/Xstartup`. Since only the latter contains a call to `/usr/bin/sessreg`, the login record `/var/run/utmp` is not updated for a login on display :0. As a consequence, the output of `who` does not necessarily list the user after login through XDM. This was already discussed in the bug report FS#26395.

As a simple fix, append the following line to `/etc/X11/xdm/GiveConsole`:

    exec /usr/bin/sessreg -a -w /var/log/wtmp -u /var/run/utmp -x /etc/X11/xdm/Xservers -l $DISPLAY -h "" $USER

This change also enables the `getuser` function presented in Acpid to work.

Retrieved from "https://wiki.archlinux.org/index.php?title=XDM&oldid=270336"
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- Display managers

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