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It works on the slider and it previously worked on a keyboard that had brightness keys. My new keyboard does not have dedicated keys. So I want to add a keybind in settings -> keyboard shortcuts -> add custom shortcut.

What is the command for it though? xbacklight -10 and xbacklight +10 does not work... any other ideas?

Thank you!

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Thank you Harry! These two commands worked :)

Step up:

gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepUp

Step down:

gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.gnome.SettingsDaemon.Power.Screen.StepDown

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