I have samsung UA40D6600 and everything works fine. If I play any movie / video (mkv etc.) directly through USB, my TV outputs 5.1 DTS / DD whatever is there in the movie / video to my AV receiver via HDMI ARC. But smarthub apps, Netflix in particular, only outputs 2 channel pathetic sound. I don't think its 2.1 even cuz I have seldom heard the woofer. Any ideas on this.
Further to this, some people have complained about the skipping sound problem, in my reckoning, it happens when the sound input to your receiver or output from your TV is different and you have enforced a different sound mode on your receiver. For example, your tv is outputting 2.1 channel stereo and you have set the sound mode as Neo 6 cinema or whatever on your receiver. Just change it to 'direct' or original and it would be fine.