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The monitor driver queries the WDDM driver for the Brightness Query Interface and device driver interface (DDI) support during initialization. 1.If the WDDM driver supports the necessary DDI, then the monitor driver uses the driver interface to control the panel brightness levels.
How To Adjust The Brightness Of The HP EliteBook 8440P Screen. If you have a HP EliteBook 8440P, you might need to occasionally change the screen brightness. To improve the results when adjusting the brightness and contrast settings of your display, use Display Color Calibration.