So I am back with Ubuntu 14.04 LTS for the moment because I figured out what was wrong with audio all this time. (multiple things)
can’t wait for the next ubuntu LTS or will go back to Fedora, I swear… the lack of proprietary driver support is the only thing I dislike there. the rest is awesome.

1) Pulseaudio is just shit without a proper systemd implementation (works like a charm for fedora 23)
2) HDMI passthrough has to be specifically enabled in plex settings
3) Nvidia prorietary driver needs to be used for proper hdmi audio passthrough
4) pulseaudio fix needs to be uncommented in /usr/bin/plexhometheater.sh to disable it
5) alternatively apt-get remove pulseaudio < -- after setup, will try again in April 2016 6) HDMI passthrough on your amplifier is counter-productive / sets itself to the wrong source when you sleep the media center / wake without amplifier enabled 7) HDMI-CEC needs more work, now it is just fuckign things up when enabled so DISABLE for now (once I have playstation 4, chromecast and more HDMI stuffz I can re-enable it. after a lot of testing and playing around with it I can now watch AAC, DTS and Dolby surround 2, 5 and 7 channels - everything works and survives reboots. Continue reading →