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.
I have the same question, for me the KDE slider works like 1/6 of the time. Do you have an Nvidia GPU?
yeah
brightnessctl is useful, can do percentage-wise. With some shell math you can also make buttons to increase and decrease it
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