The class driver sends this request to signal to the minidriver that it should reset its power state. pSrb->DeviceState specifies the new power state. See HW_STREAM_REQUEST_BLOCK.
The minidriver should set one of the following as the status in the SRB:
Indicates successful completion of the command.
Indicates that the function is not supported by the minidriver.
Indicates that a hardware failure occurred and low power cannot be invoked.
If the minidriver needs to save or restore device-specific data it should do so when processing an SRB_CHANGE_POWER_STATE request.
For more information about power states, see Managing Power for Individual Devices.