Screen brightness changes randomly

installed f36 on my MSI Modern Bm4w laptop with ryzen 5 4000 series chip and AMD Radeon graphics card. for some reason, the screen brightness changes itself randomly from time to time even tho I’m not even touching the computer.

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My experience (with an HP laptop using AMD Ryzen and Radeon) is similar to yours. I haven’t experienced random changes in brightness while it’s running, but the brightness on booting DOES seem to be random.
There’s nothing like that going on on my DELL laptop w/Intel.

Same for me on a Microsoft Surface Go 2.

I’ve posted a possible solution with libinput’s device quirks on keyboard - Brightness randomly up and down on MSI laptop - Ask Ubuntu. Please let me know if it works for you too.