MTMR
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Brightness slider seems not working if the built-in display is not set as the primary monitor
I plug an external monitor and set it to be primary. In this case the brightness slider seems not working for the built-in display while the three finger gesture works.
Here is my test environment: MacBook Pro 2018 (13-inch, OS version: 10.14.4) MTMR version: v0.20.3
2019 MBP16r, macOS Catalina 10.15.5 Brightness slider works great -- unless external monitor connected (eg via displayPort) at which point the slider stops working at all. Interestingly, "brightnessUp" and "brightnessDown" buttons do still work even w external monitor connected.
I have the same issue that brightness
slider isn't working when you attach an external monitor.