[signde]

7.1 HD Audio decoding to lossless Multichannel PCM audio output:
- Apple devices running OSX / Kodi
- Various Intel devices - NUC's, Chromebox, Braswell
- Intel Cherry Trail microarchitecture, running Windows.
- RPi 2/3
- nVIDIA Shield (can do full HD Audio passthrough using native Android Apps).
- Google Nexus Player
- WeTek Core running WeTek's Jarvis 16.1 Mediaplayer, see HERE
- WeTek Hub running WeTek's Jarvis 16.1 Mediaplayer.

I doubt you intended this list to be exhaustive but you can add the Amazon Fire TV 2 to the list of "7.1 HD Audio decoding to lossless PCM Multichannel audio output" devices as it works for me.

It should be noted though that a lot of devices I have tried with Kodi and 7.1 PCM suffer from this unresolved bug. The surround back and side surround channels are reversed - surround back plays on surround sides and vice versa. Using the "Dolby TrueHD 7.1 Channel Check" and "DTS-HD MA 7.1 Speaker Phase sample videos, I have confirmed that bug on

Fire TV 2: Kodi 16.1, SPMC 16.3, and Kodi 17 alpha2
Nexus Player: Kodi 16.1 and Kodi 17 alpha2
Macbook Pro Retina OSX: Kodi 16.1

The channels are mapped correctly on

Windows (mac intel bootcamp): Kodi 16.1
AMD A50M Hudson M1: LibreELEC 7 and LibreELEC v7.90.002 ALPHA
Raspberry Pi 2: LibreELEC v7.90.002 ALPHA
Macbook Pro Retina OSX: Kodi 17.0

Edit 02/05/2017:
As of v17 final, the 7.1 PCM audio now maps correctly on Mac OS.