Read the statement by Michael Teeuw here.
cronjob vcgencmd display_power
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 @megagprime 
 Did you ever figure this out? I’m having the same issue
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 @Nneuland nope, still no dice. building a new mm now, will update 
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 @megagprime @Nneuland depending on the board firmware, the vcgencmd may or may not work this was reported and worked thru in the fall. 
 see https://forum.magicmirror.builders/topic/17185/pir-sensor-problem-after-restart-raspi/20?_=1672509926391
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 @sdetweil hi there, i still dont see a fix or alternative workaround. The commands themselves work i just cant get it to work with cronjon :( 
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 @megagprime what user is cron executing them as? what user do you use when testing? cron is root by default unless u add another parm for the username 
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 @sdetweil i use sudo for cron and root vcgencmd display_power for the command. no idea if i am doing this right but like i said, i used to work lol 
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 @sdetweil i use sudo for cron and have tried root and just the vcgencmd, neither work 
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 @megagprime I think vcgencmd needs a DISPLAY env variable 
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 @sdetweil yes i use vcgencmd DISPLAY_POWER 0 or 1, like i said those commands work just fine just not in cron 
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