I'm having the same issue with function keys for brightness on the HP Elite Dragonfly G2. F3 and F4 both map to muting the microphone. This is a firmware bug. It happens on the latest version of Ubuntu and on Fedora 34. Really, this needs to be fixed. If someone would take a look at the firmware, we could solve this issue for all affected HP business laptops.
I'm having the same issue with function keys for brightness on the HP Elite Dragonfly G2. F3 and F4 both map to muting the microphone. This is a firmware bug. It happens on the latest version of Ubuntu and on Fedora 34. Really, this needs to be fixed. If someone would take a look at the firmware, we could solve this issue for all affected HP business laptops.