If the keys are responsive but the screen does not change, the issue is likely software or hardware related rather than a simple setting change. Ambient light sensor being covered by dust or a screen protector.
Diagnosing and Fixing MacBook Pro Backlight Issues: Display Assembly Insights
These range from simple user settings to complex hardware issues. Identifying the root cause is the most effective way to avoid unnecessary repairs or part replacements.
Cleaning this area usually resolves unintended dimming. Once disabled, you can manually set a comfortable level that does not fluctuate.
Diagnosing MacBook Pro Backlight Issues: Common Causes and Solutions
For MacBook Pro with Apple silicon, simply restart the computer. Apple Support or an authorized service provider can perform a diagnostic test to determine if the repair is cost-effective.
More About Backlight not working on macbook pro
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