I have UE55RU8002UXXH tv and HW-K960 soundbar (same as HW-K950).
I know that my sounbar does not support atmos via ARC so i have also bought Feintech VAX01202 that converts TV's arc audio for sounbars normal HDMI input.
From TV settings i have enabled Dolby digital+ and Atmos compatibility. Also input signla plus is on. TVs internal netflix shows Atmos logo and I have also selected atmos audiotrack but sounbar doesn't recognise atmos. I do get sound but not in Atmos format. Same thing with Nvidia shield. Xbox won't allow Atmos at all for some reason.
All cables are HDMI 2.0 and i have tried different cables also.
Any ideas how to get these working other than buying new TV and soundbar.