Why is my screen brightness not changing

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The OS is Windows 10 Pro and is up to date. The BIOS version is 305 from September this year, which seems to be the latest version.Keep in mind that it is the built-in screen that is the problem, not any screen connected to the dock. The manual can be found on manualslib-dot-com (I'm not allowed to post links here). The docking station I use is Andersson LPD 2.0, which is based on the DisplayLink chipset.

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