// dispmprt.h

DXGKDDI_DISPLAYMUX_PRE_SWITCH_TO DxgkddiDisplaymuxPreSwitchTo;

NTSTATUS DxgkddiDisplaymuxPreSwitchTo(
  PVOID DriverContext,
  ULONG VidPnTargetId,
  ULONG CurrentBrightnessLevel
)
{...}
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Windows Driver Kit DDI reference (nc-dispmprt-dxgkddi_displaymux_pre_switch_to)

Description

Dxgkrnl calls the kernel-mode display driver's (KMD) DxgkddiDisplayMuxPreSwitchTo function to notify the driver currently not connected to the display that the display is about to be switched to its GPU.

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.

`CurrentBrightnessLevel`

[in] The current brightness level for the panel.

Return value

DxgkddiDisplayMuxPreSwitchTo returns STATUS_SUCCESS if it succeeds. Otherwise, it returns an appropriate NT_STATUS error code.

Remarks

This DDI is called under synchronization level 2.

For more information, see Automatic Display Switch.

DXGKDDI_DISPLAYMUX_PRE_SWITCH_TO - NtDoc