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I Made Screen Brightness Control on Gnome Much Better
(gitlab.gnome.org)
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this post was submitted on 27 Nov 2023
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Typically their is some sort of low-level knob in
/sys(tryfind /sys | grep backlight) which can be used to set it to any value. Be careful playing around though because0is often completely off and it can be hard to set it back. (Although a reboot should fix it if nothing tries to be clever and preserve it at shutdown.)