Running Ubuntu 22.04.2 LTS, whenever my inactivity delay kicks in, my screen seems to go blank, but it is not really black, as is noticeable in a dark room. As a result, my monitor's energy saving doesn't become active.
I can manually set the delay with 'xset dpms 300 400 600', which works as expected, exactly once, but as soom as the screen is reactivated, the problem is back, and I need to xset again.
Any help on this is appreciated...
gsettings get org.gnome.settings-daemon.plugins.power idle-brightness
gsettings set org.gnome.settings-daemon.plugins.power idle-brightness 0