@d0zza the monitor is energy star compliant,and is warning you that it will turn off if no input is received on 15 minutes. you cannot change this
but this means the module turned off the hdmi port and not the monitor.
as I posted in discord, there are different commands that do different things
tvservice, vcgencmd, dpms, and cec-utils
if your monitor is also cec compliant, software can turn it off and on.
none of my monitors can be controlled w software, so I end up blanking the screen by hiding all the modules
https://discord.com/channels/545884423703494657/793511982103134211/824322810385006592