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This object requests the miniport to indicate whether it can transition its NIC to the low-power state specified in the InformationBuffer of an associated NdisRequest query. The following table shows the NDIS_DEVICE_POWER_STATE values that indicate low-power state.
| Value | Description |
|---|---|
| NdisDeviceStateD1 | This specifies a device state of D1. |
| NdisDeviceStateD2 | This specifies a device state of D2. |
| NdisDeviceStateD3 | This specifies a device state of D3. |
An OID_PNP_QUERY_POWER request is not used to request a transition to a device state of D0. NDIS simply sends an OID_PNP_SET_POWER request that specifies a device state of D0.
By returning NDIS_STATUS_SUCCESS to this request, the miniport guarantees that it will transition the NIC to the specified device power state on receipt of a subsequent OID_PNP_SET_POWER request. The miniport, in this case, must do nothing to jeopardize the transition.
An OID_PNP_QUERY_POWER request is always followed by an OID_PNP_SET_POWER request. The OID_PNP_SET_POWER request may immediately follow the OID_PNP_QUERY_POWER request or may arrive at an unspecified interval after the OID_PNP_QUERY_POWER request. A device state of D0 specified in the OID_PNP_SET_POWER request effectively cancels the OID_PNP_QUERY_POWER request.
An intermediate driver must always return NDIS_STATUS_SUCCESS to a query of OID_PNP_QUERY_POWER. An intermediate driver should never propagate an OID_PNP_QUERY_POWER request to an underlying miniport.
Requirements
OS Versions: Windows CE .NET 4.0 and later.
Header: Ntddndis.h.
See Also
NDIS_REQUEST | NdisRequest | NDIS_PM_PACKET_PATTERN | NDIS_PNP_CAPABILITIES | OID_PNP_SET_POWER
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