Applets : DDC/CI Monitor Brightness : Cinnamon Spices
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Applets : Brightness and gamma applet : Cinnamon Spices
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Brightness Controller
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How do I adjust the brightness/contrast step size on the shortcuts in KDE? - Support - Manjaro Linux Forum
You can change your screen brightness of all the external monitors and the main PC from the taskbar itself using a Twinkle Tray app. The app is free on the Microsoft store. :
