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===== X-Server =====

==== General ====
  startx                                         #Start X-Server
  startx -- :1                                   #Start 2. X-Server (Desktop)
  startx /path/to/program/ -- :1                 #Start programm in 2. X-Server
  startx fluxbox -- :1 -config xorg2.conf        #Start 2. X-Server with program "fluxbox" with second screen-resolution

  sax2                                           #Repair X-Server (on Suse)
  
Text x-config tool runs in text mode:
  xf86config

xorg.conf manuelly:

  xorgconfig                                     #Creates /etc/X11/xorg.conf

Order when X-Server starts:
  startx -> xinit -> xinitrc -> xclients


Execute X on Remote PC and show output locally:

  ssh 123.123.123.123 Name, Passwort
  export DISPLAY=dozentRechner:1                 #":1" = 2. X-Server(Default DISPLAY=“0:0“)
  xeyes & Programm                               #Execute on 2. X-Server
  
  DISPLAY=IP:0.0
  export DISPLAY
  echo $DISPLAY

  startkde -display local_machine_name:0.0 &


Show programm on 2. screen:

  export set DISPLAY=192.168.0.1:0               #Displays on first monitor of 192.168.0.1 host
  export set DISPLAY=192.168.0.1:1               #Displays on second monitor of 192.168.0.1 host
  export DISPLAY=:1:0; mozilla
  export DISPLAY=localhost:10.0                  #Setup by connceting remote via ssh (putty) and xming (X-Server for Windows)
  
==== Problem Solution ====
Start "xrandr" on X-Terminal:

  xrandr                                         #Show config and screen resolution

Example:
VGA-Montior start (on CRTC 1) with:
  xrandr --output VGA-0 --auto --crtc 1 
Laptop-Screen shutdown with: 
  xrandr --output LVDS --off -> ok
VGA-Montior set on CRTC 0:
  xrandr --output VGA-0 --auto --crtc 0 

xdm:

  chkconfig xdm                                   #Check if "xdm" is running
  /var/log/*X*.log                                #For indication as to why it's failing to load at start.
  
==== Ubuntu ====
Install gnome:

  sudo apt-get install ubuntu-desktop
  sudo apt-get install gdm
  sudo /etc/init.d/gdm start
  sudo dpkg-reconfigure xserver-xorg
  sudo update
  sudo upgrade
  
==== X11 ====

To run a X11-Programm with root, if direct root-login is not allowed:

  *Login with your normal user (don´t execute "sudo su -" during login)
  *xauth -f ~/.Xauthority extract /tmp/Xauthtmp :10
  *Start an external X-Server (such as Xming)
  *sudo su -
  *xauth merge /tmp/Xauthtmp
  *export DISPLAY=localhost:10.0
  *xclock (or another X-Programm)