How to disable adaptive contrast on the Surface Pro and Surface Book

If your Surface Pro or Book display suddenly shifts brightness at night time this simple registry trick will solve it.
For those who own a Surface Pro (4 or 2017) or Surface Book (1 or 2), you may notice an occasional and subtle flickering of the display, especially at night with a dimmed screen. Some of that may be attributable to "adaptive contrast," which auto-adjusts aspects of the screen based on light or dark scenes.
In this quick guide, we explain the difference between adaptive contrast and adaptive brightness, and more specifically, how to disable it.

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