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In Ubuntu 16.04 I could clone the ligthdm-greeter screen for PC and beamer on about 40 machines with following script placed in /usr/local/bin:

#!/bin/bash
# Sleep until System has configured Resolutions
sleep 8
# Find 1. Screen
SCREEN1=$(xrandr --query | awk '/ connected /{ print $1 }' | head -1)
# Find 2. Screen
SCREEN2=$(xrandr --query | awk '/ connected /{ print $1 }' | tail -1)
# Set Resolution
RESOLUTION=$(xrandr --query | awk '/^ *[0-9]*x[0-9]*/{ print $1 }' | sort -g -r | uniq -d | head -1)
# Set Clone Modus with Maximum Resolution 
xrandr --output $SCREEN1 --mode $RESOLUTION $RATE_OPTION --output $SCREEN2 --mode $RESOLUTION  --same-as $SCREEN1

called from /etc/lightdm/lightdm.conf.d/50-scripts.conf with option greeter-setup-script="/usr/local/bin/clone".

Where can I link/install/call the same script in gdm/gdm3 on Ubuntu 17.10 /18.04 to get cloned greeter screens?

Reinhard
  • 21
  • Are you using the lightdm greeter in 17.10? If not ... nowhere and you will need another script calling the greeter – Rinzwind Jan 20 '18 at 17:02
  • No, I am not using the lightdm greeter. I would like to maintain the Ubuntu standard. – Reinhard Jan 21 '18 at 21:13

1 Answers1

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Creating a .desktop file e.g. clone.desktop in directory /usr/share/gdm/greeter/autostart containing a link to /usr/local/bin/clone will dynamically clone the gdm-greeter to PC-screen and beamer-screen, so both screens will show login information and make login possible.

Contend of clone.desktop:

[Desktop Entry]
Version=1.0
Type=Application
Name=Clone PC Screen and Beamer Screen for Login
Exec=/usr/local/bin/clone
Terminal=false
NoDisplay=true
Reinhard
  • 21