Requirements for WDF (non-miniport) driversĪ WDF driver that specifies SystemManagedIdleTimeout or SystemManagedIdleTimeoutWithHint in the WDF_DEVICE_POWER_POLICY_IDLE_SETTINGS structure can opt into DFx by adding the following registry key to the INF's AddReg directive section within the DDInstall.HW section:
DFx skips any device subtree with an F-state constraint.ĭFx does not power down paging or debug devices. The objective is to make systems more power-efficient and to reduce energy consumption for Windows devices across form factors.ĭFx is currently supported for devices with D-state constraints only. With DFx, the operating system directs device stacks to enter their appropriate low-power idle states when the system transitions to idle and there is no activator-brokered software activity, and thereby enables the system to enter low power more reliably. Starting in Windows 10, version 1903, version 3 of the run-time power management framework ( PoFx) provides an optional directed power model, Directed PoFx (DFx).
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