Read the statement by Michael Teeuw here.
cronjob vcgencmd display_power
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 Hi guys, i am having trouble getting the magicmirror to turn the screen on and off with cronjob. I have used them before and it used to work and works with other installations with root /usr/bin…>/dev/null 2>&1 command but does not work anymore. I have tried all these variations and none work. I have used system wide cron with sudo nano edit and the reboot actually works…  
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 this is on pi3 and i also tried modifying boot/config.txt file Enable DRM VC4 V3D driverdtoverlay=vc4-kms-v3d (changed to fkms) 
 max_framebuffers=2
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 @megagprime This is how I run mine. I have 2 scripts and I call these scripts from the cron and not the actual vcgencmd  And in the scripts I run the following:  This works perfectly for me. Give it a go and let’s see if that works. I run an RPI 3B. 
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 @mumblebaj ya even this didnt work, maybe i need to change my boot/config file back to kms 
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 @megagprime anybody have any ideas why this doesnt work and should i change my boot file? 
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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 

