KfWiki: XDMCP Remote Login

Xwindows within Xwindow

Use Xephyr

Xephyr :1 -broadcast -screen 1024x768
# or 
Xephyr :1 -query 1.2.3.4 1024x768

Xephyr -ac -screen 1280x1024  -reset -terminate 2> /dev/null :1 &

	* The ":1" = your display (displays are numbered starting with 0)
	* -ac = disable access control restrictions= allow you to forward X
	* -screen 1280x1024 = screen size
	* -reset -terminate= Xephyr should automatically close when the last X client is killed, does not always work.
	* 2> /dev/null redirects error messages.

Configure xorg.conf

# generates xorg.conf.new in /root
Xorg -configure
# test the new config
Xorg -config xorg.conf.new

Enable nvidia glx

Configure xorg to load libglx.so from nvidia rather than xorg. Xorg.0.log should say glx module is from nvidia.

Section "Files"
ModulePath "/usr/lib64/xorg/modules/extensions/nvidia"
ModulePath "/usr/lib64/xorg/modules/drivers"
ModulePath "/usr/lib64/xorg/modules"
EndSection

Xforwarding & ssh

ssh to the remote host and start graphical applications on local display

ssh -Y user@remote_host

firefox &

Using vnc with X window managers

VNC-server dependencies

xorg-x11-twm xterm xorg-x11-xauth xinitrc vnc-server

Put this in ~/.vnc/xstartup

#!/bin/sh
xrdb $HOME/.Xresources
xsetroot -solid grey
gnome-session
xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
xterm &

I think you can do this to start xfce or kde instead

startxfce4 &
# OR
# startkde &

VNC and ssh tunnel

Start vnc via xinetd by putting this file in /etc/xinetd.d

vnc

service vnc

{         flags = REUSE

        protocol = tcp         socket_type = stream         wait = no

        user = admin

        server = /usr/bin/Xvnc

        server_args = -inetd  -query localhost -once -securitytypes=none

        only_from = 127.0.0.1

        disable = no

}

Add a line to /etc/services, and restart xinetd

vnc    5900/tcp          #vncserver

Then from the connecting workstation, issue the following to bring up a ssh tunnel and start vncviewer:

ssh -L15900:localhost:5900 user@remote-server.com

vncviewer localhost:15900

Capturing mouse / keyboard event under X

use xev

Enabling wide-screen support with ATI fglrx driver

Somehow, wide-screen resolution is not available after installing the ATI driver (I have a Raedon 9600). But it CAN be enabled by tweaking parameters in /etc/X11/xorg.conf. Specifically the line Modes "1440x900" and Virtual 1440 900. My full xorg.conf

Section "Screen"
		Identifier "aticonfig-Screen[0]"
		Device     "aticonfig-Device[0]"
		Monitor    "aticonfig-Monitor[0]"
		DefaultDepth     24
		SubSection "Display"
				Viewport   0 0
				Depth     24
				Modes    "1440x900" "1280x768"
				Virtual 1440 900
		EndSubSection
EndSection

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FreeNX server and client

Enable Desktop Effects