Brightness adjustment issues on MacBook Air M1 (13.7.4) after using a brightness control app
Hello, Apple Community!
I have an incredibly rare, hard-to-reproduce bug or glitch in the firmware (drivers or something else).
I've encountered a strange issue on my MacBook Air 2021 M1 (macOS Ventura 13.7.4).
I was using the MonitorControl app to adjust the brightness of an external monitor connected via USB-C. At the same time, I had a Mac mini connected to the same monitor, also running MonitorControl and using Universal Control (Standoff?) to switch between devices by moving the cursor to the screen edge.
After this setup, my MacBook stopped adjusting brightness correctly:
- Brightness does not change after a restart.
- When lowering brightness to 0, the screen flickers (briefly turns off and then back on).
- After some time, brightness control starts working normally again.
- A full macOS reinstallation and system reset did not help. (Reinstalled 3 times)
- Apple diagnostics returned ADP000, no hardware issues.
- Removal of /Library/Preferences/com.apple.windowserver.plist did not help
It doesn’t seem to be a hardware issue, but resetting SMC/NVRAM didn’t resolve it either. Could this be related to drivers or firmware settings? What can I try to fix this issue? Any help would be greatly appreciated!
But this is definitely a software issue since it resolves itself after some time. I restart my MacBook frequently, and this problem is really frustrating. If the brightness was low or high before the reboot, it stays the same after restarting—either I can't see anything or I'm blinded by the brightness. I'm really upset that this can happen for no reason on my part.
MacBook Air 13″