After upgrading from Mojave developer beta 2 to developer beta 6, a ton of things broke and stopped working. Even on developer beta 8 (build 18A371a) this issue persists.
One of these things is the function keys, but only after a while. I tend to leave my MacBook Pro on overnight, and after that, the function keys stop working.
I've tried killing SystemUIServer and letting it restart, but that doesn't seem to work. The only solution I've found is to reboot the computer.
I'd like to be able to turn my keyboard backlight back on after closing the lid. I'd like to be able to adjust the volume without going to System Preferences.
The only keys that don't do anything are brightness, keyboard backlight, volume, etc, the ones that show a slider on the screen. The mission control key still works (enough, even though DB6 broke it horribly), the Launchpad key still works, media keys still work...
Is there a way to fix my function keys without a reboot? Rebooting can be extremely cumbersome at times and a huge inconvenience.
I have a normal, physical keyboard (thank god I don't have a touch bar), with physical function keys. Most of the controls work, and the ONLY controls that DON'T work are the ones that trigger sliders like the following to show on screen, which are the brightness, illumination (keyboard backlight), and volume controls:
My build number is 18A371a. When these keys stop working, some other things stop working as well, such as About This Mac, the sleep/restart/shutdown controls, the Messages app, as well as some other things. It really seems like some critical process is crashing, but I don't know what to restart.
Update: I found which process is crashing, and I have submitted a bug report to Apple:
The Radar number is 4873261.