I have uploaded a modified version of the 2.8.0 Buster .iso image
after being informed that it still had the default screen blanker and
(even more inappropriately for a CNC machine controller) the
screen-locker.

An install from the new .iso file has been sat overnight here without
blanking the screen or locking.

To disable screen blanking on an already-installed system I would suggest:

1) Navigate to /etc/xdg/autostart and delete the files
light-locker.desktop and xscreensaver.desktop
2) Create a file "10-monitor.conf" in the  /etc/X11/xorg.conf.d
directory (you might need to create the directory) containing the
following:

------------------8<-------------------------------
# Attempt to turn off all screensavers and screen blanking.
# You don't want that on a CNC controller

Section "Extensions"
    Option      "DPMS" "Disable"
EndSection

Section "ServerFlags"
    Option "StandbyTime" "0"
    Option "SuspendTime" "0"
    Option "OffTime" "0"
    Option "BlankTime" "0"
EndSection

Section "ServerLayout"
    Identifier "ServerLayout0"
EndSection
------------------8<-------------------------------

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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