Solution: Macbook brightness automatically dims on wakeup
Solution that worked for me if your Macbook M1 display automatically dims upon wakeup even if you have Auto-Adjust Brightness disabled in settings. Sooooo annoying.
Step 1: System Settings -> Displays -> TURN OFF Auto Brightness Adjust
Step 2: System Settings -> Battery -> Options -> TURN OFF "Slightly dim the display when on battery"
Fixed it.
MacBook Pro 13″, macOS 14.6