Multiseat for Dual headed(Multiple headed) grapic (VGA) cards version-0.1

I have tested this method only with Debian lenny and still using without any problem

1) Copy following script to /usr/bin/duautomseat and make it executable with chmod +x /usr/bin/duautomseat


#!/bin/bash
# Copyright (C) 2008 Nayanajit Mahendra Laxaman mail: nmlaxaman@gmail.com

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#input format
#:1 -auth /var/lib/gdm/:1.Xauth -nolisten tcp vt8

LOG=/tmp/duauto.log
export DISPLAY=:0
export XAUTHORITY="/var/lib/gdm/:0.Xauth"
echo $DISPLAY >> $LOG
echo $XAUTHORITY >> $LOG

PARAMS=$@
echo $PARAMS >> $LOG

keyboards=( echo $(ls -l /dev/input/by-path/ | grep -event- | grep kbd | awk -F '../' {'print $2'}) )
mouses=( echo $(ls -l /dev/input/by-path/ | grep -event- | grep mouse | awk -F '../' {'print $2'}) )

pkeyboards=($(ls /dev/input/by-path/ | grep -event- | grep kbd ))
pmouses=($(ls /dev/input/by-path/ | grep -event- | grep mouse ))

keyboards=$pkeyboards
mouses=$pmouses


kbd1=${keyboards[1]}
kbd2=${keyboards[2]}

mouse1=${mouses[1]}
mouse2=${mouses[2]}

screen1="1024x768@0+0+0"
screen2="1024x768@0+1024+0"

ac1=1
ac2=2

#PARAMS="dpms -switchCmd echo -2button -nozap -br $PARAMS"
PARAMS="dpms -nozap -br $PARAMS"

command=

if [[ $1 == :1 ]]; then
command="/usr/bin/Xephyr -ac :$ac1 -screen $screen1 -keybd evdev,,device=/dev/input/$kbd1,xkbrules=xorg,xkbmodel=evdev,xkblayout=us,CoreKeyboard -mouse evdev,,device=/dev/input/$mouse1,Emulate3Buttons=true,CorePointer $PARAMS"
fi

if [[ $1 == :2 ]]; then
command="/usr/bin/Xephyr -ac :$ac2 -screen $screen2 -keybd evdev,,device=/dev/input/$kbd2,xkbrules=xorg,xkbmodel=evdev,xkblayout=us,CoreKeyboard -mouse evdev,,device=/dev/input/$mouse2,Emulate3Buttons=true,CorePointer $PARAMS"
fi

echo $command >> $LOG
echo '<<>>' >> $LOG
exec $command



2) Backup your /etc/gdm/gdm.conf with mv /etc/gdm/gdm.conf /etc/gdm/gdm.conf.bak and create a new will as /etc/gdm/gdm.conf with following content in it


[servers]
0=Xephyr0
1=Xephyr1
2=Xephyr2

[server-Xephyr0]
name=Xephyr0
command=/usr/bin/X -br -dpms -s 0
handled=false
flexible=false

[server-Xephyr1]
name=Xephyr1
#default params :1 -auth /var/lib/gdm/:1.Xauth -nolisten tcp vt8
command=/usr/bin/duautomseat
handled=true
flexible=false

[server-Xephyr2]
name=Xephyr2
#default params :2 -auth /var/lib/gdm/:2.Xauth -nolisten tcp vt8
command=/usr/bin/duautomseat
handled=true
flexible=false

[greeter]
#Greeter=/usr/bin/loginduautomseat
GraphicalThemes=circles/:debian-moreblue/:happygnome/:happygnome-list
GraphicalThemeRand=true
GraphicalTheme=circles


3) Install wmctrl and xephyr with apt-get install xserver-xephyr wmctrl and modify /etc/gdm/Init/Default script with appending following code snippets before exit 0 line at the bottom


export DISPLAY=:0
export XAUTHORITY="/var/lib/gdm/:0.Xauth"
XEID=$( xwininfo -root -children -display :0 | grep 'Xephyr on :1' --max-count=1 | awk '{print $1}' )
[[ $XEID != '' ]] && wmctrl -i -r $XEID -e 0,1024,0,-1,-1


4) Configuring /etc/X11/xorg.conf; bellow is my configuration for my nVidia GeForce 6200 graphic card:



Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc104"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection

Section "Device"
Identifier "Configured Video Device"
Driver "nvidia"
Option "Twinview" "true"
EndSection

Section "Monitor"
Identifier "Configured Monitor"
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
DefaultDepth 24
Subsection "Display"
Depth 24
Modes "1024x768"
Virtual 2048 768
EndSubSection
EndSection

Section "ServerFlags"
Option "DontZap" "true"
# Option "DontVTSwitch" "true"
# Option "HandleSpecialKeys" "Always"
# Option "BlankTime" "0"
# Option "StandbyTime" "0"
# Option "SuspendTime" "0"
# Option "OffTime" "0"
# Option "AllowMouseOpenFail" "true"
EndSection




* Since Screen resolution is hard-corded in duautomseat and /etc/gdm/Init/Deafault code snippets, you have to change them according to your screen resolution.

* Now logout and see...

Cheers !!!

Ref:http://netpatia.blogspot.com/2008/02/multiseat-computer-with-ubuntu-804.html