I lost sound of Display Port from installation of 10.13.4
Get my sound back by Workaround 1 in Post #2.
If any of you need AppleHDA.kext_v280.12 (extracted from OS 10.13.3), see attachment.
My steps are:
1. After installation of OS 10.13.4, install [AppleHDA.kext_v280.12], restart
2. Install...