[_Spook_]

Windows only ... the updater - not sure what they are thinking ...

I know. Will have to make a windows drive for these kind of updates...

EDIT: Oh yeah! That firmware did it! Works like a charm now. Except passthrough, but that's not a big deal for me
EDIT2: Spoke to soon. Works fine in Kodi. But linux speakertest no go. But oh well. Seems like a firmware and kernel issue. Not a Kodi issue. Passthrough works on AC3 and DTS. Not DTS-HD, TrueHD and so on.
EDIT3: This is the same issue as I had with the Club3D miniDP->HDMI2.0 adapter with the Paradetech PS176 chip. So it's a firmware issue. The NUC6i7KYK has the PS175 chip, basically the same chip with same firmware. https://communities.intel.com/thread/102165 explains the same thing.