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soft-brightness
Gnome-shell extension to manage your display brightness via an alpha overlay (instead of the backlight).
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InfluxDB
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If you are interested, read this https://www.ddcutil.com/, if you search some ddcutil examples of usage online, you should be able to find example commands to change the monitor brightness. Then you can also use these commands as keyboard shortcuts!
Assuming you're using Gnome, there is for example https://github.com/F-i-f/soft-brightness but note that this will probably just send darker pixels to the screen and not reduce the backlight brightness. Which means your screen will use more power than necessary and picture quality will probably be worse.