Many Mac OS X / MacOX / whatever versions: Unable to modify the volume with the keyboard – Ask Different
Posted by jpluimers on 2019/02/22
This has happened to me on most Macs with most Apple Mac OS X / MacOS / whatever versions: the built in sound controls for internal speakers and head phones fail to work (keyboard shortcuts and UI both fail).
The solution at [WayBack] mavericks – Unable to modify the volume with the keyboard – Ask Different works, but be sure to require the kernel module steps:
open up a Terminal window and run:
sudo killall coreaudiodsudo kextunload /System/Library/Extensions/AppleHDA.kext sudo kextload /System/Library/Extensions/AppleHDA.kext
–jeroen
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