You would like to use an attached display to show the ROON web display? Don´t do it on low powerd machines

# add a dedicated user for it 
sudo useradd -m roon-display 
sudo passwd roon-display
# and now install some lightwight X enviroment
sudo apt-get install xorg chromium openbox lightdm xdotool unclutter
# thisis evil
sudo mv /etc/pam.d/lightdm-autologin /etc/pam.d/lightdm

# and edit the lightdm.comf
sudo nano /etc/lightdm/lightdm.conf

modify the following section

[Seat:*]
autologin-user=roon-display
user-session=openbox

Now we configure a very basic window manager called openbox for the autologin user.

 mkdir -p ~/.config/openbox
nano ~/.config/openbox/autostart

and add the following content

xset s off
xset -dpms
xset s noblank
unclutter -display 0:0 -noevents -grab

chromium \
    --disable-gpu \
    --no-first-run \
    --disable \
    --disable-translate \
    --disable-infobars \
    --disable-suggestions-service \
    --disable-save-password-bubble \
    --start-maximized \
    --kiosk "http://localhost:9330/display/" &

The –disable-gpu option took me quite some time to find out. The Mesa Driver for the Iris XE integrated INTEL processor graphic used in combination with the chromium browser has a rendering bug in combination deploying two SODIMMs (thus enable dual channel DRAM access)

Added unclutter to hide the Mouse Pointer.

We should reconnect – here every 5 Minutes – from time to time (is it a bug or feature ?)

as user roon-display do (important needs to be executed in the right user context)

crontab -e

and add

*/5 * * * * DISPLAY=:0 /home/roon-display/crontabrefresh.sh

and now we create a script for it

nano ~/crontabrefresh.sh

#!/bin/bash
xdotool key shift+F5

and make it executable

chmod +x ~/crontabrefresh.sh