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After upgrading to 6.3, brightness started to randomly increase. This most commonly happens after logging in after boot and wake-up, but can just randomly happen as well. This issue was also present at a much older (can't remember which one) version of Plasma 6 as well, but was fixed.
I use a desktop PC with LG 24GL600F-B monitor. The brightness is set to 0 in both the monitor's own settings and Plasma's, but it randomly increases to either 100 or 30.
Using Wayland session.
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Looks like a regression in plasma 6.3:
https://bugs.kde.org/show_bug.cgi?id=500116
https://www.reddit.com/r/kde/comments/1 … ess_in_63/
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