Brightness button not working & settings for brightness disappeared

Jaya_Shankar wrote:

my laptop brightness keys ( f1 and f2 ) are not working even in my system settings brightness info is totally disappeared

https://discussions.apple.com/content/attachment/d8fb8969-850d-4e21-9069-279f51575bda

Did I press any shortcuts accidentally or what's wrong with my laptop??

Thank you!

old issue , new issue , what changed?

To trouble shoot further you can:

—Try a SafeBoot https://support.apple.com/en-us/HT201262

—Test issue in another user (or guest user) account https://support.apple.com/guide/mac-help/set-up-other-users-on-your-mac-mtusr001/mac

On a Intel Mac you can—

Try resetting the SMC https://support.apple.com/en-us/HT201295

Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379

(get at least two-three rounds of the chimes when holding the NRAM Reset)

if no resolve you can sort anomalies—

How to reinstall macOS from macOS Recovery - https://support.apple.com/en-us/HT204904