Calling PoStartNextPowerIrp from a Bus Driver

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Beginning with Windows Vista, calling PoStartNextPowerIrp is not required and call to this routine performs no power management operation. However, in Windows Server 2003, Windows XP, and Windows 2000, a bus driver must call PoStartNextPowerIrp once for every IRP_MN_QUERY_POWER or IRP_MN_SET_POWER request that the driver receives.

A bus driver always calls this routine in its DispatchPower routine, before it calls the IoCompleteRequest routine.