F1 and F2 brightness keys on MacBook Pro OS 12
When I press F1 and F2 the brightness is locked. How do I unlock? Other F keys are working.
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LynnSClark wrote:
I have a MacBook Pro 14" 2021 and just updated to the latest Monterey 12.4. The model has the keyboard across the top with F1 F2 etc. (not the touchbar) and the F1 and F2 used to control brightness. I am not sure when they became locked but I think I inadvertently did something that caused this. I was hoping the update would fix it but it didn't. Thanks for any suggestions.
run the user Diagnostic...not as definitive as Apple's own AST2 (Apple Service Toolkit) back bench diagnostic, but may kick out an error code for a hardware issue.
Use Apple Diagnostics to test your Mac
Use Apple Diagnostics to test your Mac - Apple Support
To trouble shoot further you can:
—SafeBoot How to use safe mode on your Mac - Apple Support
Takes a bit longer to get to the login screen, does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc.
Login and test. Reboot as normal and test. Caches get rebuilt automatically.
In Safe mode third party system modifications and system accelerations are disabled, it removes malware, etc hampering smooth operation, however a reboot will put it back to normal mode.
This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.
—Test issue in another user (or guest user) account Set up users, guests, and groups on Mac - Apple Support
This will tell you if it a universal issue or isolated to your user/admin account.
Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus
all known to cause issues on the macOS