USB Monitor Brightness and Contrast Control via ScreenBright

Overview

This document covers the new feature for the DisplayLink DL-4xxx series available from DisplayLink driver release 8.1 Alpha as a preview. From the general release 8.1 M0, any user will be able to change brightness and contrast on USB monitors using any utility complying with the DDC/CI standard. This allows users to use a single application to change brightness and contrast on all their displays, either connected through any DisplayLink product, or to a standard computer graphics card.
DDC/CI stands for Display Data Channel / Command Interface and is a standard protocol for monitors to exchange with computers.

Description on How to Use the Feature

Any utility implementing DDC/CI and not restricted to a particular other brand of monitor can be used with the DisplayLink DL-4xxx series, and all other DisplayLink shipping products. Because it is not attached to a particular manufacturer and it implements DDC/CI appropriately, we will be using the mature ScreenBright freeware in this guide. You can however use another tool, including your own. ScreenBright also has the advantage of being a small portable executable which can be used via a command line or through a graphical user interface (GUI).
  1. Download ScreenBright 0.2.5 from your preferred freeware distribution website,
  2. Run Screenbright.exe to start the application,
  3. If you have multiple monitors, select which monitor you wish to adapt by clicking on the appropriate tab,
  4. Adjust the brightness and/or contrast slider.
The value is saved in the monitor’s memory; therefore, you do not need to keep the utility running nor do you need to run it at each startup. 

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