why doesn't the Z390 Aaros Pro support Modern Standby?

[Euroman1981]

Since I got my Z390 Aaros Pro motherboard in late 2019 there is something I don't get.

I have a modern standby enabled PSU, and to my knowledge the 2 other components of Modern standby support si0x and C - powerstate should both be supported by the Z390 chipset.

https://wccftech.com/intel-z390-chipset-details-official/

So why does my Z390 Aaros Pro system say this?

PS C:\Windows\system32> powercfg -a
The following sleep states are available on this system:
    Standby (S3)
    Hibernate
    Hybrid Sleep
    Fast Startup

The following sleep states are not available on this system:
    Standby (S1)
        The system firmware does not support this standby state.

    Standby (S2)
        The system firmware does not support this standby state.

    Standby (S0 Low Power Idle)
        The system firmware does not support this standby state.

Is it Gigabyte who have went ahead and disabled it in the firmware?

[shadowsports]

Greetings,
The Z390 does support Modern Standby, but many motherboard manufacturers choose not to support it (desktops).  Primary reason seems to be that some hardware cannot support this low power state and/or can work erratically.  Other things can effect support.  Energy efficiency standards for electronics varies by country or state.

Example: CEC 2019 Ready.  To what degree standards are mandated varies.  Like cars.  I live in California.  This state has more stringent emissions requirements in comparison to other states.

For me, S3 is very capable.  Nearly instant on in my case.  Tap spacebar and the system is up before I can even sit down.  I personally don't need my systems doing stuff when sleeping.  Updates, background tasks, etc. 

I found articles on the web with powershell commands that can enable S0.  Sleep will still appear on the Start menu, but its behavior might change.  You should be able to confirm by running powercfg -a.  What happens next might be determined by the hardware you have installed.   

I'd make a full system image of my OS before experimenting.

You can always open a ticket with eSupport to inquire.