DXGKDDI_DISPLAYMUX_PRE_SWITCH_TO callback function (dispmprt.h)
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.
Syntax
DXGKDDI_DISPLAYMUX_PRE_SWITCH_TO DxgkddiDisplaymuxPreSwitchTo;
NTSTATUS DxgkddiDisplaymuxPreSwitchTo(
PVOID DriverContext,
ULONG VidPnTargetId,
ULONG CurrentBrightnessLevel
)
{...}
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.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 11, version 24H2, update 2025.01 |
| Header | dispmprt.h |
| IRQL | PASSIVE_LEVEL |