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Debian in particular has the ddcci-dkms package that once installed should solve the entire problem and let you control external monitors the same way you control internal ones.

I just found it, and I have to restart KDE to see if it worked, so no certainty here yet :)

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Using this module, Powerdevil does not allow you to set values individually per monitor, instead gives you only a single slider. This is absolutely sufficient for single monitor or multi monitor setups with identical models, but in my case I need the option to set the brightness individually since my monitors are all differently bright on 100%.

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