Its because every part of the hardware is controlled via Power Management, S0iX is not a sleep or suspend state (except for Win32 Apps) it is an ultra-low powered superset of the S0 Power State (On), so anytime the machine is putting any part of itself in a low power state it envolks S0iX. It has much more in common with an ARM Device's Power Management than a traditional Intel System.Thank you for the technical information.
At least this gives me an answer I can give the customer
“Microsoft SP3 do not support that function and what you are asking for is not possible”
I still do not fully understand why having a switch / function turning off the display when the cover is closed will change SP3 to “a non-connected Standby Machine”.
To me this has nothing to do with suspend / sleep or other Power state functions. I am not defining or setting the standards so if it is as this there is not much I can do about it.
Also, if I may ask why aren't your customers taking advantage of utilizing Dual Monitors (SP3 Screen and the External)?