Intel has been struggling with the audio passthrough for some of the more advanced formats. It seems there is a new firmware for the MegaChips LSPCon. You can download the 1.65 firmware from the Intel Download Center. The update tool must be run in Windows…
Unfortunately I’m currently travelling so am unable to confirm that it really fixes the issue completely. Someone able to perform the upgrade and let everyone know in the comments whether it worked or not? Thanks!
I did describe the upgrade process in my previous post.
To recap, the issue that we were seeing was that DTS-HD or Dolby TrueHD audio formats did not work at all in passthrough mode if you have a HDMI 2.0 capable amplifier. The previous fix was a step to the right direction (they started working at 1920×1200@60Hz mode and 4k modes), but it still did not work ok at 1920×1200@24p resolution.
Follow the discussion at Intel’s NUC community as well.