Where is DPMS configuration save?

I’m missing something obvious I’m sure, but I can’t see a CMOS setting that applies to the enabled or disabled status of DPMS and also the delay period.

Second questions is, why isn’t it saving on my Beagle-XM? (no widget fitted)¹
Not having set up the Pi as yet I don’t know whether that behaves in the same way.

(Edit:) Tests on RPCEmu show a change in the CMOS file suggesting it is saved in CMOS. Tests on the beagle show a change in timestamp of the saved settings (to file)

¹ I have one, but things should work without shouldn’t they?

Following up – simply powering down and plugging in the widget and then setting the DPMS results in a saved setting.

So, it seems there is a small bug in SDCMOS affecting the DPMS settings.