Brightness control platform infrastructure
This section summarizes the platform requirements for supporting brightness control functionality on a Windows PC.
In this section
| Topic | Description |
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Windows interfaces with the Windows Display Driver Model (WDDM) graphics driver to determine the presence of an integrated display. If an integrated display is detected, Windows will query the WDDM driver for the DXGK_BRIGHTNESS_INTERFACE_2 interface. This interface is mandatory for all WDDM 1.2 drivers. The presence of this interface indicates that the driver supports brightness control of the integrated display. |
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Windows 8 is designed to provide a fast and fluid user experience. |
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All portable Windows 8 devices are expected to deliver extended battery life. This is particularly true for thin and lightweight touch-based tablet devices. The display backlight is one of the greatest consumers of power in these devices. The amount of power consumed by the display is often directly proportional to the brightness level produced by the backlight. |
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Windows supports two main mechanisms for changing brightness through keyboard shortcuts (hot keys): Human Interface Device (HID), and Advanced Configuration and Power Interface (ACPI) notifications. |
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Windows 8 provides native support for Ambient Light Sensors (ALS). If a platform includes ALS hardware, we recommend that system manufacturers use the guidelines provided in Advanced Configuration and Power Interface Specification to fully integrate the ALS hardware with Windows. |