wpChangePowerState Parameter - ulparm2

ulparm2 (ULONG) - input

Parameter 2.

This parameter contains a complex value. The ULONG value is composed of two separate USHORT values.

DevId (USHORT)

Requested device identifier.

0x0001

All system-managed services.

System-managed devices are the hardware-system specific set of devices that support power-managed states. Because this set of devices is hardware specific, each system configuration may have unique support capabilities.

Note: All other DevId values are reserved for future use.
PwrState (USHORT)
Requested power state that the devices specified in DevId are to be set to.

0x0001

Standby State Request.

This state indicates that the specified devices should be set into a power conservation mode that consists of a partial power level that allows for improved energy conservation without noticeable power up delays for re-established operation.

0x0002
Suspend State Request.

This state indicates that the specified devices should be set into a power conservation mode that consists of a partial power level that allows for substantial energy conservation with accepted noticeable power-up delays for re-established operation.

Note: All other PwrState values are reserved for future use.

Example of ulparm2 construction:

DevId(USHORT) = 0001h
PwrState(USHORT) = 0002h
ulParm2 = MAKEULONG(DevId,PwrState)

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