Disable modern standby (S0) on Windows 11

Execute powercfg /a

C:\Users\user>powercfg /a
The following sleep states are available on this system:
    Standby (S0 Low Power Idle) Network Connected
    Hibernate
    Fast Startup
 
The following sleep states are not available on this system:
    Standby (S1)
        The system firmware does not support this standby state.
        This standby state is disabled when S0 low power idle is supported.
 
    Standby (S2)
        The system firmware does not support this standby state.
        This standby state is disabled when S0 low power idle is supported.
 
    Standby (S3)
        The system firmware does not support this standby state.
        This standby state is disabled when S0 low power idle is supported.
 
    Hybrid Sleep
        Standby (S3) is not available.
        The hypervisor does not support this standby state.
 
 
C:\Users\user>

Create a .reg file with the following contents, and merge it into registry.

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power]
"PlatformAoAcOverride"=dword:00000000