The
PowerCfg utility tries to report the reason a system doesn??™t support a particular sleep state, but
usually fails.
/DEVICEQUERY queryflags Displays a list of devices that meet the criteria specified by the
queryflags argument. You may use more than one query flag to narrow the list of returned
devices. The number of devices that support particular power off and wake-up features on a
modern system is amazing. However, you usually need to know how the devices will react
when setting up a power critical device such as a laptop. For example, it doesn??™t help to place the
devices in an S1 sleep level when most of them don??™t support that mode. The following list
describes the query flags.
wake_from_S1_supported Returns all devices that support waking the system from a
light sleep.
wake_from_S2_supported Returns all devices that support waking the system from a
deeper sleep.
wake_from_S3_supported Returns all devices that support waking the system from the
deepest sleep state.
wake_from_any Returns all devices that support waking the system from any sleep mode.
S1_supported Lists devices that support light sleep states.
S2_supported Lists devices that support deeper sleep states.
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