le11/12 broke nuc support
I too have nuc11pah (for similar reasons you mentioned , incl.CIR)
For some reasons le 11/12 does not detect/offer multiple hdmi and/or dp outputs.
I use hdmi for tv direct (4k) and sometimes dp for hd audio, for the 1% content that's worth switching on the 'big' audio.
In le 10 things work as expected, LE 12 OTOH insists on sending video to dp if both are on. That might be OK, if your receiver is 4k capable, mine isn't (why?)
Also, somewhat unrelated, watching 4k TV via the tv-headend client doesn't work, although triggering a recording, then watching the recorded video does work. I guess it's a format problem of the live rtsp stream.
I'm waiting for le12++ to see if that helps. Until then, the nuc is powerful enough to do 4k on le11 ( I dunno about HDR though, lack of content)