f.lux possibly interfering with CoreBrightness
I have (quite an old) MBP mid-2014, with Big Sur. I am using f.lux for many years and for over a year Lunar. Lunar is an app to control the brightness of external monitors attached to your Mac.
What I noticed is that if f.lux starts before Lunar, and I make my Mac go to sleep and wake it up that CoreBrightness events are not picked up by Lunar anymore. I restarted Lunar many times, got in touch with the developer and debugged the problem. In the end, every time when I restart f.lux, the brightness events start coming back to Lunar.
Could you help me with this issue?