Verified by our QA. Changing tag to "verification-done-xenial".
Thanks, Jamie, below steps were helpful.
This bug did not repro with [Ubuntu 16.04] + kernel 4.4.0-116-generic : 384.111
I've verified output through all channels (7.1) using Test Sound option in
Sound Setting + by running different 4,6 channel clips using aplay.
Connections were made using DP-HDMI dongle + DENON-AVR
** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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ALSA backport missing NVIDIA GPU codec IDs to patch table to Ubuntu
16.04 LTS Kernel
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
Add support for 4/6/8 channel sound in 16.04 LTS kernel for future
This commit first introduced in "Thu Jul 13 19:27:39 2017" has
what is needed base on discussion we had with nvidia:
 - Commit
ALSA: hda - Add missing NVIDIA GPU codec IDs to patch table
Add codec IDs for several recently released, pending, and historical
NVIDIA GPU audio controllers to the patch table, to allow the correct
patch functions to be selected for them.
 - git describe --contains 74ec118152ea494a25ebb677cbc83a75c982ac5f
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