Machine: Dell Vostro PC, System: Ubuntu 18.04, Desktop: Gnome 3.28 running Wayland.
Is there a command within Linux so that my monitor goes into standby after a fixed period of idle time?
I know with the GUI I can set the idle time for up to 15 mins through the Settings-->Power selection. But supposing I want to set this period longer, eg 20 mins. I've looked at xrandr and xset options, but neither seem to give any examples of actually doing this, and I would have expected it to be a common query, but no-one appears to asked it.
Also is there a way of making this setting indefinite rather than just for a session?