IAdapterPowerManagement3::D3ExitLatencyChanged method (portcls.h)
PortCls calls the D3ExitLatencyChanged method while the device is in sleep (D3) power state, to provide a new exit latency value.
Syntax
NTSTATUS D3ExitLatencyChanged(
[in] PC_EXIT_LATENCY NewD3ExitLatency
);
Parameters
[in] NewD3ExitLatency
The PC_EXIT_LATENCY enumerated value that Portcls has determined for the device.
Return value
This method returns an NTSTATUS value.
Remarks
The D3ExitLatencyChanged method is only called when the device is the D3 power state. When Portcls wakes the device into D0, it does so via PowerChangeState3, and the device must be able to exit its sleep state within the latency period indicated by NewD3ExitLatency. Waking the audio adapter in this manner allows the driver to use the most appropriate method to adjust the power state of the audio adapter within the time-frame indicated by the NewD3ExitLatency value.
The following table shows the possible values for NewD3ExitLatency.
| Exit Latency | Meaning |
|---|---|
| PcExitLatencyInstant | The driver must wake the audio adapter instantly with no latency. |
| PcExitLatencyFast | The driver must wake the audio adapter within 10 milliseconds. |
| PcExitLatencyResponsive | The driver must wake the audio adapter within 200 milliseconds. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 8 |
| Minimum supported server | Windows Server 2012 |
| Target Platform | Universal |
| Header | portcls.h |