Hello, I have Mojave 10.14 installed on my system and I have problem with the combo jack audio. It's noisy when I plug in and listening to music, like when you half-plug your jack to the connector. Also Mic isn't working with the combo jack headset. Sound working well with only audio jack (like external speakers).
Internal Speakers and Internal Mic are good. External mic (only mic) doesn't tested : lack of mic
Tested with another headsets, same results. Working under Windows.
Fixed by installing ALCPlugFix and CodecCommander.kext
System:
CPU: i5-6300HQ 2.8 GHz
Audio: ALC 255 (Using AppleALC in EFI/CLOVER/kexts/Other, layout-id=3)
Tested with VoodoHDA too, same result.