How to have monitor go into sleep mode

[mmccaffe]

How can OPNsense put the display/monitor into sleep mode after some time?

[Alphabet Soup]

I've never had to do this with my OPNsense systems as none of them even have video output.  On a FreeBSD system it's just a matter of loading the green_saver kernel module, which is included in OPNsense.  Maybe somebody knows if this can be done via the OPNsense GUI?

If you're not afraid of the console, open a shell as root and type 'kldload green_saver'.  I think the default is 5 minutes of no keyboard/mouse activity, or you can hit Shift-Pause to activate immediately.