[LightDM] Troubles with MultiSeat

Fri Mar 10 08:33:22 UTC 2017

Hello,

I'm Powi, I'm trying to do MultiSeat with lightdm, but when I change the
configuration of /etc/lightdm/lightdm.conf, I get a black screen on
reboot and nothing happend. So I searched in
/var/log/lightdm/lightdm.log for the reason of the bug, I saw that :

||[+0.30s] DEBUG: DisplayServer x-1: Can't launch X server
/etc/lightdm/Xephyr-command.sh -p 1 -t 640x480 -P evdev -s
/dev/input/by-id/usb-PixArt_USB_Optical_Mouse-event-mouse -c
/dev/input/by-id/usb-Dell_Dell_USB_Keyboard-event-kbd -v bepo, not found
in path [+0.30s] DEBUG: DisplayServer x-1: X server stopped [+0.30s]
DEBUG: Releasing VT 8 [+0.30s] DEBUG: Seat 1: Display server stopped
[+0.30s] DEBUG: Seat 1: Can't create display server for greeter|
(Pointed by Mimoza from debian-fr.xyz ) |

Mimoza said it try to launch another X server that's impossible with one
only graphic card, should find the reason.

Well, I'm coming to you asking if it's still possible to do MultiSeat
with lightdm with only one graphic card. And If it still possible, what
is wrong, please.

Joined :
lightdm.conf from /etc/lightdm
session-setup-script.sh from /etc/lightdm
Xephyr-command.sh from /etc/lightdm
Xephyr-greeter-setup.sh from /etc/lightdm
Xorg.0.log from /var/log
lightdm.log from /var/log/lightdm

Thanks !
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#
# General configuration
#
# start-default-seat = True to always start one seat if none are defined in the configuration
# greeter-user = User to run greeter as
# minimum-display-number = Minimum display number to use for X servers
# minimum-vt = First VT to run displays on
# lock-memory = True to prevent memory from being paged to disk
# user-authority-in-system-dir = True if session authority should be in the system location
# guest-account-script = Script to be run to setup guest account
# logind-load-seats = True to automatically set up multi-seat configuration from logind
# logind-check-graphical = True to on start seats that are marked as graphical by logind
# log-directory = Directory to log information to
# run-directory = Directory to put running state in
# cache-directory = Directory to cache to
# sessions-directory = Directory to find sessions
# remote-sessions-directory = Directory to find remote sessions
# greeters-directory = Directory to find greeters
#
[LightDM]
#start-default-seat=true
greeter-user=root
#minimum-display-number=0
#minimum-vt=7
#lock-memory=true
user-authority-in-system-dir=false
#guest-account-script=guest-account
#logind-load-seats=false
#logind-check-graphical=false
#log-directory=/var/log/lightdm
#run-directory=/var/run/lightdm
#cache-directory=/var/cache/lightdm
#sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions
#remote-sessions-directory=/usr/share/lightdm/remote-sessions
#greeters-directory=/usr/share/lightdm/greeters:/usr/share/xgreeters

#
# Seat defaults
#
# type = Seat type (xlocal, xremote)
# xdg-seat = Seat name to set pam_systemd XDG_SEAT variable and name to pass to X server
# pam-service = PAM service to use for login
# pam-autologin-service = PAM service to use for autologin
# pam-greeter-service = PAM service to use for greeters
# xserver-command = X server command to run (can also contain arguments e.g. X -special-option)
# xserver-layout = Layout to pass to X server
# xserver-config = Config file to pass to X server
#xserver-allow-tcp = True if TCP/IP connections are allowed to this X server
# xserver-share = True if the X server is shared for both greeter and session
# xserver-hostname = Hostname of X server (only for type=xremote)
# xserver-display-number = Display number of X server (only for type=xremote)
# xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true)
# xdmcp-port = XDMCP UDP/IP port to communicate on
# xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in keys.conf)
# unity-compositor-command = Unity compositor command to run (can also contain arguments e.g. unity-system-compositor -special-option)
# unity-compositor-timeout = Number of seconds to wait for compositor to start
# greeter-session = Session to load for greeter
#greeter-hide-users = True to hide the user list
# greeter-allow-guest = True if the greeter should show a guest login option
# greeter-show-manual-login = True if the greeter should offer a manual login option
# greeter-show-remote-login = True if the greeter should offer a remote login option
#user-session = Session to load for users
# allow-user-switching = True if allowed to switch users
# allow-guest = True if guest login is allowed
# guest-session = Session to load for guests (overrides user-session)
# session-wrapper = Wrapper script to run session with
# greeter-wrapper = Wrapper script to run greeter with
# guest-wrapper = Wrapper script to run guest sessions with
# display-setup-script = Script to run when starting a greeter session (runs as root)
# display-stopped-script = Script to run after stopping the display server (runs as root)
# greeter-setup-script = Script to run when starting a greeter (runs as root)
# session-setup-script = Script to run when starting a user session (runs as root)
# session-cleanup-script = Script to run when quitting a user session (runs as root)
# autologin-guest = True to log in as guest by default
# autologin-user = User to log in with by default (overrides autologin-guest)
# autologin-user-timeout = Number of seconds to wait before loading default user
# autologin-session = Session to load for automatic login (overrides user-session)
# autologin-in-background = True if autologin session should not be immediately activated
# exit-on-failure = True if the daemon should exit if this seat fails
#
[SeatDefaults]
#type=xlocal
#xdg-seat=seat0
#pam-service=lightdm
#pam-autologin-service=lightdm-autologin
#pam-greeter-service=lightdm-greeter
#xserver-command=X
#xserver-layout=
#xserver-config=
xserver-allow-tcp=false
#xserver-share=true
#xserver-hostname=
#xserver-display-number=
#xdmcp-manager=
#xdmcp-port=177
#xdmcp-key=
#unity-compositor-command=unity-system-compositor
#unity-compositor-timeout=60
#greeter-session=example-gtk-gnome
greeter-hide-users=false
#greeter-allow-guest=true
#greeter-show-manual-login=false
#greeter-show-remote-login=true
user-session=lightdm-xsession
#allow-user-switching=true
#allow-guest=true
#guest-session=xfce4
session-wrapper=/etc/X11/Xsession
#greeter-wrapper=
#guest-wrapper=
#display-setup-script=
#display-stopped-script=
#greeter-setup-script=
session-setup-script=/etc/lightdm/session-setup-script.sh -a 5 -v 7
#session-cleanup-script=
#autologin-guest=false
#autologin-user=human
#autologin-user-timeout=2
#pam-service=lightdm-autologin
#autologin-user-timeout=0
#autologin-in-background=false
#autologin-session=UNIMPLEMENTED
#exit-on-failure=false

#
# Seat configuration
#
# Each seat must start with "Seat:".
# Uses settings from [SeatDefaults], any of these can be overriden by setting them in this section.

[Seat:0]
xserver-command=nohup X -br -dpms -s 0 -novtswitch -nocursor
greeter-session=fake-greeter

[Seat:1]
xserver-command=/etc/lightdm/Xephyr-command.sh -p 1 -t 640x480 -P evdev -s /dev/input/by-id/usb-PixArt_USB_Optical_Mouse-event-mouse -c /dev/input/by-id/usb-Dell_Dell_USB_Keyboard-event-kbd -v bepo
greeter-setup-script=/etc/lightdm/Xephy-greeter-setup.sh -p 1
greeter-session=lightdm-greeter

[Seat:2]
xserver-command=/etc/lightdm/Xephyr-command.sh -p 2 -t 640x480 -P evdev -s /dev/input/by-id/usb-Logitech_USB_Optical_Mouse-event-mouse -c /dev/input/by-id/usb-Microsoft_Microsoft®_Digital_Media_Keyboard-event-kbd
greeter-setup-script=/etc/lightdm/Xephy-greeter-setup.sh -p 2
greeter-session=lightdm-greeter

[Seat:3]
xserver-command=/etc/lightdm/Xephyr-command.sh -p 3 -t 640x480 -P evdev -s /dev/input/by-id/usb-PIXART_USB_OPTICAL_MOUSE-event-mouse -c /dev/input/by-id/usb-Microsoft_Microsoft®_Digital_Media_Keyboard-event-kbd
greeter-setup-script=/etc/lightdm/Xephy-greeter-setup.sh -p 3
greeter-session=lightdm-greeter

#
# XDMCP Server configuration
#
# enabled = True if XDMCP connections should be allowed
# port = UDP/IP port to listen for connections on
# key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not use authentication (stored in keys.conf)
#
# The authentication key is a 56 bit DES key specified in hex as 0xnnnnnnnnnnnnnn.  Alternatively
# it can be a word and the first 7 characters are used as the key.
#
[XDMCPServer]
#enabled=false
#port=177
#key=

#
# VNC Server configuration
#
# enabled = True if VNC connections should be allowed
# command = Command to run Xvnc server with
# port = TCP/IP port to listen for connections on
# width = Width of display to use
# height = Height of display to use
# depth = Color depth of display to use
#
[VNCServer]
#enabled=false
#command=Xvnc
#port=5900
#width=1024
#height=768
#depth=8
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