I'm trying to use multiseat with Ubuntu, but I can't make this work.
I've read a lot of "how to", and the most of them are about doing a multiseat with some distro with GDM2, or KDM. But, I'm using the lightdm of Ubuntu.
So now I'm trying to make this multiseat with Xephyr, which I've already used to make a multiseat with the Debian 4 version. But I don't know how to call Xephyr in lightdm.conf.
There is a sample of LightDM setup for multiseat using Xephyr. It looks like Andrzej Pietrasiewicz (the author of the blog copied/referenced below) created a PPA with all the code displayed below. By installing that PPA, you should be able to get a lightdm installation to work "magically".
Note: As I have been trying to get that to work, I have not succeeded yet. However, I can tell you that there are a certain number of contradictory parameters in what follows.
Some important parts:
Something like that:
+------------------------------- Display :0 -----------------------------+
| X server |
| |
| +--------- Display :1 ----------+ +--------- Display :2 ----------+ |
| | Xephyr 1 | | Xephyr 2 | |
| | User A | | User B | |
| | | | | |
| | | | | |
| | | | | |
| +-------------------------------+ +-------------------------------+ |
| |
+------------------------------------------------------------------------+
The xorg.conf file:
# File: /etc/X11/xorg.conf
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
Option "Xinerama" "0"
EndSection
Section "Files"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection
Section "ServerFlags"
# start even without the mouse
Option "AllowMouseOpenFail" "yes"
# disable VT switching
#Option "DontVTSwitch" "yes"
# Ctrl+Alt+Backspace disable
#Option "DontZap" "yes"
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Philips 170B4"
HorizSync 30.0 - 82.0
VertRefresh 56.0 - 76.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 8400 GS"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "1"
Option "TwinViewXineramaInfoOrder" "DFP-0"
Option "metamodes" "CRT: nvidia-auto-select +0+1080, DFP: nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Source: http://beforeafterx.blogspot.com/2011/02/multiseat-setup-xorgconf.html
The script in lightdm.conf:
# File: /etc/lightdm/lightdm.conf
[LightDM]
greeter-user=root
user-authority-in-system-dir=false
common-vt=true
[SeatDefaults]
xserver-allow-tcp=false
greeter-hide-users=true
user-session=lightdm-xsession
session-wrapper=/etc/X11/Xsession
[Seat:0]
xserver-command=X -br -dpms -s 0 -novtswitch
greeter-session=xinerama
[Seat:1]
xserver-command=/etc/multiseat/scripts/Xephyr-seat-1
greeter-session=multiseat-greeter-1
[Seat:2]
xserver-command=/etc/multiseat/scripts/Xephyr-seat-2
greeter-session=multiseat-greeter-2
Source: http://beforeafterx.blogspot.com/2012/08/multiseat-setup-lightdmconf.html
The multiseat scripts start Xephyr with parameters describing the mouse and keyboard to use for that seat. I will do my best to find out that information and provide it here too.
#!/bin/bash
# File: /etc/multiseat/scripts/Xephyr-seat1, Xephyr-seat2, ..., Xephyr-seatN
#
# $1 - display number of this Xephyr
. /etc/multiseat/scripts/helper-functions
trap "" usr1
XEPHYR=/root/Xephyr-new
export DISPLAY=:0
export XAUTHORITY=/var/run/lightdm/root/:0
SEAT=1
SIZE=`get_conf $SEAT SIZE`
KEYBOARD=`get_conf $SEAT KEYBOARD`
LAYOUT=`get_conf $SEAT LAYOUT`
MOUSE=`get_conf $SEAT MOUSE`
DPI=`get_conf $SEAT DPI`
exec $XEPHYR -retro -screen ${SIZE} -keybd evdev,,device=/dev/input/${KEYBOARD},xkbrules=evdev,xkbmodel=evdev,xkblayout=${LAYOUT} -mouse evdev,,device=/dev/input/${MOUSE} -dpi ${DPI} $1
Source: http://beforeafterx.blogspot.com/2012/08/multiseat-configuration-xephyr-seat-1.html
The greater referenced in the lightdm is also a separate shell script. Note that I would recommend you reference /bin/sh instead of /bin/bash. I did not see anything that would require bash. Note that it references the default lightdm-gtk-greeter at the end.
#!/bin/bash
# File: /etc/multiseat/scripts/multiseat-greeter-1, ..., multiseat-greeter-n
#
# multiseat wrapper around ligthdm greeter in order to position a Xephyr instance
#
. /etc/multiseat/scripts/helper-functions
PRIMARY=`get_conf 0 PRIMARY`
SEAT=1
if [ $SEAT != $PRIMARY ]; then
XEP=`XAUTHORITY=/var/run/lightdm/root/:0 xwininfo -root -children -display :0 | grep "Xephyr on :$SEAT" --max-count=1`;
XEPHYR_WIN_ID=`echo ${XEP} | cut -d' ' -f1`;
DISPLACEMENT=`get_conf $SEAT DISPLACEMENT`
DISPLAY=:0 XAUTHORITY=/var/run/lightdm/root/:0 wmctrl 2>&1 -v -i -r ${XEPHYR_WIN_ID} -e 0,0,${DISPLACEMENT},-1,-1;
fi
XAUTHORITY=/var/run/lightdm/root/:$SEAT
DISPLAY=:$SEAT
exec /usr/sbin/lightdm-gtk-greeter
Some of the functions may be defined in the following script. Somehow, it includes yet another multiseat script that I haven't seen yet...
# File: /etc/multiscript/scripts/helper-functions
. /etc/default/multiseat
#
# private implementation of get_sect
#
# get given section's contents from the given config file
#
# $1 filename
# $2 section number
#
__get_sect()
{
cat $1 | awk -v sect=$2 '
BEGIN {
SECT="^\\[" sect "\\]"
NEXT_SECT="^\\[" (sect + 1) "\\]"
}
$0 ~ SECT, $0 ~ NEXT_SECT {
if ($0 ~ SECT)
next;
if ($0 ~ NEXT_SECT)
next;
if (substr($1, 1, 1) == "#")
next;
print
}
'
}
#
# private implementation of get_conf
#
# get given key's contents from the given section
# from the given config file
#
# does not work for tables in the config file
#
# $1 filename
# $2 section name
# $3 key name
#
__get_conf()
{
__get_sect $1 $2 | awk -F"=" -v key=$3 '
BEGIN {
KEY=key
}
$1==KEY {
print substr($0, index($0, "=") + 1)
}
'
}
#
# private implementation of get_num_seats
#
# get number of seats from the default config file
#
# $1 filename
#
__get_num_seats()
{
cat $1 | awk '
BEGIN {
count=0
}
/^\[[0-9]*\]/ {count++}
END {
print count - 1
}
'
}
#
# get given section's contents from the default config file
#
# $1 section name
#
get_sect()
{
__get_sect $CONFIG $1
}
#
# private implementation of get_table
#
# $1 filename
# $2 section number
# $3 table name
# $4 size/entry switch [-size => size, <number> for entry]
#
__get_table()
{
SIZE=0;
ENTRY=-1
if [ $4 == "-size" ];
then
SIZE=1;
else
ENTRY=$4
fi
RESULT=`__get_sect $1 $2 | awk -v table=$3 -v get_size=$SIZE -v entry=$ENTRY '
BEGIN {
print BEGIn
TABLE=table "\\\=" "\\\("
GET_SIZE=get_size
ENTRY=entry
size=0
}
$0 ~ TABLE, /^\)/ {
if ($0 ~ TABLE)
next;
if ($0 ~ /^\)/)
next;
if (substr($1, 1, 1) == "#")
next;
if (get_size == 0 && size == entry){
print
exit
}
size++;
}
END {
if (get_size)
print size;
}
'`
RESULT=`echo $RESULT | sed 's/^[ \t]*//g'`
echo $RESULT
}
#
# get given key's contents from the given section
# from the default config file
#
# does not work for tables in the config file
#
# $1 section name
# $2 key name
#
get_conf()
{
__get_conf $CONFIG $1 $2
}
#
# get number of seats from the default config file
#
get_num_seats()
{
__get_num_seats $CONFIG
}
#
# get size of a given table in the given section of the config file or
# get specified entry of the table
#
# $1 section number
# $2 table name
# $3 size/entry switch [-size => size, <number> for entry]
#
get_table()
{
__get_table $CONFIG $1 $2 $3
}
The fake-greeter script is a sleeper. It just sleeps until it gets killed by a full shutdown. Apparently, this is not required. According to a comment, the -noreset option is enough to avoid having to wait like this. I will report later once I tested for myself.
#!/bin/bash
# File: /etc/multiseat/scripts/fake-greeter
pid_set=0
kill_sleep()
{
if [ $pid_set -ne 0 ];
then
kill -15 $pid
fi
exit 0
}
trap 'kill_sleep' TERM
while true;
do
sleep 1000 &
pid=$!
pid_set=1
wait $pid
done
The same blog says that he is having problems with udev and he has to re-reset it so multi-seat works properly. This was in August 2012 so I do not know whether that would still apply in 2014.
#!/bin/sh
# File: /etc/init.d/multiseat
### BEGIN INIT INFO
# Provides: multiseat
# Required-Start: bootlogs
# Required-Stop:
# Default-Start: 1 2 3 4 5
# Default-Stop:
# Short-Description: Trigger udev rules
# Description: For some reason the rules for multiseat config need to be
# fired once more and later than at the very beginning.
### END INIT INFO
/sbin/udevadm trigger
To properly setup this script on your system, run the following command:
sudo update-rc.d multiseat defaults
Again, I do not know whether this script is required at this point. Just organizing the scripts offered by Before after X.
Source: http://beforeafterx.blogspot.com/2012/08/multiseat-setup-initdmultiseat.html
try xrdp it will be the easiest solution. I installed vnc4server and then installed xrdp. and then I used rdesktop / tsclient / remmina to connect xrdp machine using IP Address.
There is a wonderful blog detailing the process of getting an Xephyr based multiseat set up. He also is using Lightdm. Hope it helps.
