I have the same question, for me the KDE slider works like 1/6 of the time. Do you have an Nvidia GPU?
this post was submitted on 02 Oct 2025
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yeah
Ddc/ci brightness changes are very often animated by the display firmware, so doing it fast is rarely possible.
You can however disable ddc/ci in the display settings if you'd rather have software brightness.
brightnessctl is useful, can do percentage-wise. With some shell math you can also make buttons to increase and decrease it
brightnessctl doesn't work with Wayland
It does? I use it on KDE Wayland
Extra checked the name of the thing
I use it to change brightness via KDE Connect.
Huh. I should check again
It doesn't work for me on SwayWM, maybe KDE does something else under the hood?
Edit: lol Sorry, I mistook xrandr for brightnessctl. (I had aliased xrandr brightness change commands to "brightness" in my shell)
LOL