Disabling automatic brightness changes by the BIOS However, a call to the display miniport driver's DxgkDdiGetPossibleBrightness function shouldn't report more brightness level values than the hardware supports. You must decide how to map hardware levels to the range of brightness level values. The increment between levels isn't required to be uniform, and a laptop computer can support any number of distinct values up to the maximum of 101 levels. The only requirement for values from zero to 100 is that larger values must represent higher brightness levels. Every laptop computer must report a maximum brightness level of 100 however, a laptop computer isn't required to support a level of zero. Brightness levelsīrightness levels are represented as single-byte values in the range from zero to 100 where zero is off and 100 is the maximum brightness that a laptop computer supports. If the monitor driver can't use either brightness-control mechanism or if the display miniport driver supplies the brightness control interface but fails a call to the DxgkDdiGetPossibleBrightness function, the monitor driver doesn't support brightness controls. No alternative mechanism exists to signal the monitor driver about shortcut key notifications. If either the display miniport driver or BIOS-exposed ACPI methods support brightness controls, the monitor driver registers for ACPI notifications of brightness shortcut keys. This is different from the Windows 2000 Display Driver Model, which supports only display panels with an identifier of 0x0110. In the Windows Display Driver Model (WDDM), an ACPI identifier is not used to identify an integrated display panel. ![]() For more information about these methods, see the ACPI specification on the ACPI website. If the display miniport driver doesn't support at least the Brightness Control Interface, the monitor driver uses ACPI to query for the _BCL, _BCM, and _BQC methods on the child device.
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