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Do you use a LG UltraFine Display and an external keyboard? Are your display brightness keys working? If not, do you use Karabiner Elements? Yes? You probably have to remap your functions. Go to the settings → function keys and map the "brightness" to the keys you want.
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Have this display for a year now. Always thought that was an incompatbility bug with the UltraFine Display and M1 macs. 🤦