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There is also Clight (https://github.com/FedeDP/Clight) if you want automatic backlight adjusting given ambient brightness. It supports external monitors through ddcutil C library and has many more features to offer. Disclaimer: i am its creator ;)

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I've tried setting up clight on various occasions and now gave it a shot again, whilst I appreciate all the documentation I'm still struggling to get it working on NixOS with swaywm on a laptop. I'm primarily interested in adjusting screen brightness based on my webcam. I'm already using redshift/gammastep.

Uh that's sad! There is actually an issue opened about NixOS; but, since I am not using it, it's pretty hard for me to debug. If you want some help you can comment on that issue though!

Thanks! Totally overlooked that. I've managed getting through the first hurdles last night, I'll leave some more feedback on GitHub :).

It is Linux only btw.

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