When a Miracast session is starting, and a monitor is connected to the Miracast sink or the driver receives an I/O request from the Miracast user-mode driver because a new monitor has connected to the Miracast sink, the display miniport driver should report a monitor arrival hot-plug detection (HPD) awareness value to the operating system by calling the DxgkCbIndicateChildStatus function.

The Miracast target should remain in a disconnected state until Dxgkrnl starts a Miracast connected session. The driver shouldn't report more than one Miracast target on any full WDDM graphics device, otherwise the operating system fails to start the adapter.Īfter Dxgkrnl calls DxgkDdiQueryInterface to query the Miracast display interface, the driver can then report the target type as D3DKMDT_VOT_MIRACAST during device initialization when Dxgkrnl calls the DxgkDdiQuer圜hildRelations function. If the operating system's DirectX graphics kernel subsystem (Dxgkrnl.sys) doesn't call the DxgkDdiQueryInterface function to query the Miracast display interface, then it doesn't support Miracast wireless displays, and the display miniport driver shouldn't report any Miracast target. If the WDDM 8.1 display miniport driver supports Miracast displays, it must report the DXGK_MIRACAST_DISPLAY_INTERFACE structure, which has pointers to driver-implemented Miracast functions, when the Microsoft DirectX graphics kernel subsystem calls the DxgkDdiQueryInterface function.

To support Miracast wireless displays on Windows 8.1, WDDM 1.3 display miniport drivers that run in kernel mode need to do the following tasks. Microsoft might remove support for custom Miracast stacks in a future version of Windows. The relevant WHLK documentation at .WirelessDisplayĭriver developers should no longer implement a custom Miracast stack. For information about the Microsoft Miracast stack and the requirements of drivers and hardware to support Miracast displays starting in Windows 10, see the following documentation:īuilding best-in-class Wireless projection solutions with Windows 10

Starting in Windows 10 (WDDM 2.0), the operating system ships with a built-in Miracast stack that can work on any GPU.

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