XDM

From ArchWiki
Revision as of 18:52, 24 May 2012 by Jermi (Talk | contribs) (Installation)

Jump to: navigation, search

This template has only maintenance purposes. For linking to local translations please use interlanguage links, see Help:i18n#Interlanguage links.


Local languages: Català – Dansk – English – Español – Esperanto – Hrvatski – Indonesia – Italiano – Lietuviškai – Magyar – Nederlands – Norsk Bokmål – Polski – Português – Slovenský – Česky – Ελληνικά – Български – Русский – Српски – Українська – עברית – العربية – ไทย – 日本語 – 正體中文 – 简体中文 – 한국어


External languages (all articles in these languages should be moved to the external wiki): Deutsch – Français – Română – Suomi – Svenska – Tiếng Việt – Türkçe – فارسی

Summary help replacing me
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.

Make the ~/.xsession file executable.

$ chmod 744 .xsession
Note: You do not need ~/.xsession if you use ~/.xinitrc

Alternatively XDM can use the ~/.xinitrc file. If you do not already have the ~/.xinitrc file you can copy the default by executing:

cp /etc/skel/.xinitrc ~/

Be sure to edit the ~/.xinitrc file to include your specific Desktop Environment / Window Manager by placing the appropriate line at the bottom of ~/.xinitrc. For the i3 window manager this line would look like:

exec /usr/bin/i3

To make the graphical login the default method of logging into the system, edit your /etc/inittab file (recommended) by adding or uncommenting this line:

x:5:respawn:/usr/bin/xdm -nodaemon

As well as changing the default init level from 3 (Multi-user) to 5 (X11) by modifying the first settings line of /etc/inittab

id:3:initdefault

Change the 3 to a 5

id:5:initdefault:

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 the Quick Image Viewer:
# pacman -S 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 and then make sure dbus is included in the DAEMONS array in /etc/rc.conf.

Also, make sure that you are actually starting your window manager, for example with the command xmonad in ~/.xsession.


XDM does not update login records

The vanilla config of XDM calls /etc/X11/xdm/GiveConsolve 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.