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Today I learned that there’s a utility called ddcutil for Linux (sudo apt install ddcutil) that you can use to set the brightness of external monitors.

e.g., on my machine, to set the external monitor to 30% brightness:

sudo ddcutil setvcp 10 30

github.com/elementary/wingpane

(Should make a good feature alongside Night Light in elementary OS.)

@aral ddcutil is also a godsend for switching between monitor inputs with e.g. some global key bindings, which can in some cases help you forego an expensive kvm switch!

@aral Ohhh thank you for that very usefull tool 😍

@astro Sag mal Bescheid wenn das bei dir unter :nixos: läuft, bei mir beschwert es sich:

> Module i2c-dev is not loaded and not built into the kernel.
> ddcutil requires module i2c-dev

das zu beheben ist mir aber gerade nicht wichtig genug :blobpeek:

@schmittlauch Ich habe aufgehört externe Bildschirme zu nutzen seitdem ich Sway nutze, denn HDMI kann hier nur der nVidia-Treiber. Ich bin selbst schuld und bereue es seit Jahren.

@aral but be careful on some AMD GPUs, they have a broken i2c implementation and tend to hang even after reboot. A complete power cycle is necessary to make those graphics cards work again.

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