{{parent page="Linux"}}

===[[LinuxXDMCP XDMCP Remote Login]]===
===[[LinuxFreeNX FreeNX server and client]]===
===[[XDesktopEffect Enable Desktop Effects]]===

===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
%%(bash)
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
%%(text;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:
%%(bash)
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 [[http://www.waterlovinghead.com/images/xorg.conf 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
%%