On Saturday 20 June 2020 04:23:35 pm Gene Heskett wrote:
> Greetings all;
> I have a need to  disable dpms and anything else associated with blanking
> the screen, sometime for around 12 hours.
>
> Our old friend xset has apparently been neutered and incapable to
> controlling any of this.
>
> So what is silently overriding these user set choices, something in TDE?
>
> Thanks all.
>
> Cheers, Gene Heskett

These not working for you?

#!/bin/bash
dcop kdesktop KScreensaverIface lock
sleep 3
xset dpms force standby
-or-
xset dpms force off

The only thing that overrides the 'standby' above for me is touching a key or 
moving the mouse.