// ntddvdeo.h

// CTL_CODE(0x0023, 0x301, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_PANEL_QUERY_BRIGHTNESS_RANGES 0x00230C04
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Windows Driver Kit DDI reference (ni-ntddvdeo-ioctl_panel_query_brightness_ranges)

IOCTL_PANEL_QUERY_BRIGHTNESS_RANGES IOCTL

Description

IOCTL_PANEL_QUERY_BRIGHTNESS_RANGES queries the brightness ranges for a display panel.

Parameters

Major code

IRP_MJ_DEVICE_CONTROL

Input buffer

Set to NULL.

Input buffer length

Set to 0.

Output buffer

A pointer to a caller-allocated buffer that receives the output data. The output is a PANEL_QUERY_BRIGHTNESS_RANGES structure in which the queried brightness levels or nit ranges are returned.

Output buffer length

The size, in bytes, of the output buffer. This value must be set to the size of the PANEL_QUERY_BRIGHTNESS_RANGES structure expected to be returned in the output buffer.

Input/output buffer

n/a

Input/output buffer length

n/a

Status block

Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful. Otherwise, it's set to the appropriate error condition as a NTSTATUS code.

IOCTL_PANEL_QUERY_BRIGHTNESS_RANGES - NtDoc