MacBook Pro 2019 Keyboard backlight going crazy

Hi msh2019,

Thank you for using the Apple Support Communities! I understand you are experiencing an issue with your keyboard backlight, and I'd like to help.

It sounds like you've taken great steps so far, which include checking the following: Adjust the brightness of your backlit keyboard - Apple Support, and Change Keyboard preferences on Mac - Apple Support. Resetting the SMC was already a good step, as it can help address keyboard backlighting issues.

Since the behavior remains, I would recommend making sure your macOS is fully updated: How to update the software on your Mac - Apple Support. If it continues from there, try booting up into safe mode. It’s a way to start up your Mac so it performs certain checks, repairs, emptying of system cache, and prevents some software from automatically loading: Use safe mode to isolate issues with your Mac - Apple Support. Once in safe mode, take notice if the exact symptoms remain. Sometimes safe mode can successfully resolve some issues. With this being said, after testing in safe mode, restart and log in as normal to see if that helps resolve the issue.

Keep me posted. Regards.

msh2019,

We appreciate you taking those steps.

Since the behavior remains, you could consider running a hardware diagnostics on your Mac, just to see if anything comes back in need of service: Diagnose problems with your Mac - Apple Support. I would also recommend reaching out to Apple Support directly to investigate the behavior in more depth: Contact - Official Apple Support.

Thank you for using the Apple Support Communities, and take care.