Why do I always have to "systemctl restart lightdm" using SSH from my phone to my desktop wake up my monitor from sleep?

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xset dpms force on
xset s noblank
xset s off
xset -dpms

None of these do anything, monitor stays dead silent. If I turn monitor on explicitly, it turns itself off soon after due to "no signal". Restart of my X session is the only way to make the monitor wake up again.

2021 is still not the of .

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