This combination just does not work. There is probably another discussion about it here, but I did not find it.
The problem has been mentioned also elsewhere, like in here: AnandTech | Intel's Haswell NUC: D54250WYK UCFF PC Review
I should have the most recent drivers for D34010WYK. 2 channel Netflix works well in HDMI, but 5.1. does not work at all.
Will there be a solution to this? This has been a known thing for a long time already.