For seemingly no reason, the macOS hotkey to control the brightness (control + F1/F2) of my LG UltraFine secondary display has stopped working.
Also, the Sound Preferences do not show LG UltraFine speakers anymore, so I cannot set the sound output to that display.
When I try to open LG Screen Manager, it quits immediately.
Can anyone else using LG UltraFine (23.7" 4K, specifically) confirm facing this issue? Any suggestions on how to fix this?
Update:
This Apple bug/personal oversight has become a nuisance on my home setup. Not only can I not control the display and sound on my UltraFine monitor through the iMac, I am unable to send the sound output from my iPad to the monitor. All this was earlier working without any problem.
When going to Apple > About This Mac > Displays, the UltraFine display shows up, implying that the monitor is being identified. But the sound and brightness controls are not working.
I have tried three different devices, an iMac, an iPad, a MBP. Neither worked, leading me to believe that the issue is with macOS/iPadOS.