// video.h

VIDEOPORT_DEPRECATED VIDEOPORT_API VP_STATUS VideoPortGetVgaStatus(
        PVOID      HwDeviceExtension,
  [out] OUT PULONG VgaStatus
);
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Windows Driver Kit DDI reference (nf-video-videoportgetvgastatus)

VideoPortGetVgaStatus function

Description

The VideoPortGetVgaStatus function detects whether the calling device is decoding a VGA I/O address.

Parameters

`HwDeviceExtension`

Pointer to the miniport driver's device extension.

`VgaStatus` [out]

Pointer to the resulting VGA status. A value of zero (0) indicates that VGA is not enabled; a value of one (1) indicates that VGA is enabled.

Return value

VideoPortGetVgaStatus returns one of the following values:

Return code	Description
NO_ERROR	The function completed successfully.
ERROR_INVALID_FUNCTION	The device was not a PCI device.

Remarks

The VideoPortGetVgaStatus function is mainly used to determine whether a device is the sole VGA-enabled device in a multiple monitor system.

View the official Windows Driver Kit DDI reference