我最近重新安装了 Windows 10 Pro，最初一切正常。但是，S3 Standby 不再可用。运行后powercfg /a显示：
C:\WINDOWS\system32>powercfg /a
The following sleep states are available on this system:
Hibernate
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 (S3)
The system firmware does not support this standby state.
Standby (S0 Low Power Idle)
The system firmware does not support this standby state.
Hybrid Sleep
Standby (S3) is not available.
The hypervisor does not support this standby state.
Fast Startup
This action is disabled in the current system policy.
我已经重置了 BIOS 设置并更改了组策略，如下所示邮政。我还更新了显卡驱动程序并安装了最新的 AMD 芯片组驱动程序。我有一块 MSI x370 Gaming Pro Carbon 主板和一台 Ryzen 1700。
编辑
我设法通过启用 SMT 修复了这个问题。如果停用 SMT，S3 待机似乎不可用。