I am running Ubuntu 20.04 server on a raspberry pi 4. My issue is that the screen does not turn off, at all.
I do not have any xserver installed, so x related answers won't work. Using setterm, I can enable screen blanking, but powerdown does nothing, even though that's what should control this. I've also tried
gettings set org.gnome.desktop.session idle-delay 10 to no avail. I tried
setterm --blank 1 --powerdown 2
I did manage to turn off the power to the hdmi with a command, but that was another day so I cannot remember the command. I'm controlling the computer directly with a keyboard, not ssh