Hi @wolfman,
it is an onbord. Sorry, if this is an important information: I completely forget about mentioning it 
Anyway, yes, searching for an 'enable' option in the BIOS was one of the first things I did. Since there was no visible option related to sound/multimedia or switching parts on/off, I thought it's worth writing about it 
This is an excerpt from some BIOS pages, as well as the device itself:
