Thanks for joining the graphics community.
I understand you are trying to get audio through HDMI.
Intel offers generic video drivers containing HDMI codec, perhaps, that is exactly what you’re missing to connect your HDMI sound system.
Please try the link below for updated graphics drivers:
https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23885&lang=eng&ProdId=3720
Allan.
