Description

Dxgkrnl calls the kernel-mode display driver's (KMD) DxgkddiDisplayMuxUpdateState function to notify the driver of the current mux state.

Parameters

DriverContext

[in] Handle to a context block that is associated with a display adapter. KMD's DxgkDdiAddDevice function previously provided this handle to Dxgkrnl.

VidPnTargetId

[in] The VidPN target that the DDI is being called for.

MuxSwitchedToTarget

[in] A Boolean value that indicates whether the mux is currently switched to connect the specified VidPnTargetId to the panel.

Remarks

This DDI is called under synchronization level 2.

Dxgkrnl calls DxgkDdiDisplayMuxUpdateState to provide the driver with the current mux state in the following cases:

• At driver start, which allows the driver to avoid timely polling sequences when the panel isn't connected.
• On return from sleep (to D0 power state from Dx). When returning from some power states (for example, hibernate) the firmware might have to reset the mux and hence the driver doesn't know the state.

DxgkDdiDisplayMuxUpdateState is called before any display-related DDIs involving the target that the mux is connected to.

For more information, see Automatic Display Switch.