Good afternoon,
End products do not only have a DisplayLink chip in them and other components impact the feature set. That is the case of the Dell D6000.
The night light feature stays in beta state as it has some issues.
For the Dell D6000, it would work on the HDMI or DP outputs. If using a DisplayPort output, you need to connect to a DisplayPort monitor, or use an *active* converter. I believe your case does not work because you use a passive adapter.
Kind regards,
Alban
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