Win HOW TO - Kodi 2D - 3D - UHD (4k) HDR Guide Internal & External Players ISO Menus
I have discovered what I assume is another bug introduced by NVidia drivers.  Yesterday I decided to work it out.  The problem:

Right click your volume icon with your AVR OFF or in standby using passthrough.  It should be setup for Stereo.
Now, turn your AVR ON.  It should be setup for 5.1 or 7.1 etc.  (What ever you use during video playback)
This should automate between stereo and 7.1 (for example) as you toggle your AVR off and on.  If it doesn't, you will have to manually change it.  If you forget, high bitrate audios will malfunction (audio filter errors) during video playback mode and/or youtube videos from desktop mode will not start.

Not knowing if this was associated with a Windows update or something else, I decided to install NVidia drivers working backwards to rule them out as the culprit or find a working driver to identify where the problem originated. 
Eventually the audio setup started working as intended and I've concluded it is an NVidia driver issue.  Here's what I installed and concluded using DDU between installs:

391.35-desktop-win10-64bit-international-whql.exe = Audio problem.
391.24-desktop-win10-64bit-international-whql.exe = Audio problem.
391.01-desktop-win10-64bit-international-whql.exe = Audio problem.
390.65-desktop-win10-64bit-international-whql.exe = Audio problem.  This is the driver the audio problem was introduced.
All of these drivers also cannot retain a 12bit setting after a reboot but you should be using 8bit anyway since 12bit introduces banding unless your display handles 12bit native properly.

388.59-desktop-win10-64bit-international-whql.exe = Does not turn HDR off after HDR playback but Audio switching problem is not present.  This was the last good driver for audio switching.
387.92-desktop-win10-64bit-international-rs3-whql.exe = Does not turn HDR on prior to HDR playback.
385.69-desktop-win10-64bit-international-whql.exe = Working properly for HDR and Audio switching but any mouse movement turns 3D into 2D briefly.  This is the driver I have reverted to.  This also means I will need to use FSE.
385.28-desktop-win10-64bit-international-whql.exe = Working properly for HDR and Audio switching. 
These drivers survive a reboot when using 12bit but again, you should be using 8bit unless your display handles 12bit native properly.

Understanding Nvidia has worked out many bugs, it now has these:

No 10bit selection when using RGB.
No auto switch from stereo to multiple speaker setup in Windows Audio considering if AVR state is On or Off. 
Audio Video sync for common refresh rates such as 23.976 f/ps leads to dropped frames without creating custom timings.

Confirmations would be appreciated.
HOW TO - Kodi 2D - 3D - UHD (4k) HDR Guide Internal & External Players iso menus
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Messages In This Thread
RE: Kodi 3D Guide - by brazen1 - 2015-06-15, 22:20
RE: Kodi 3D Guide - by brazen1 - 2015-06-15, 22:29
RE: Kodi 3D Guide - by michaelsammler - 2015-06-22, 00:38
RE: Kodi 3D Guide - by brazen1 - 2015-06-23, 17:15
RE: Kodi 3D Guide - by michaelsammler - 2015-06-24, 02:23
RE: Kodi 3D Guide - by brazen1 - 2015-06-24, 17:22
RE: Kodi 3D Guide - by michaelsammler - 2015-06-25, 09:26
RE: HOW TO - Kodi 2D - 3D - UHD (4k) HDR Guide Internal & External Players - by brazen1 - 2018-04-02, 17:12
HELP! - by brazen1 - 2018-08-22, 18:50
RE: HELP! - by zxaura1 - 2018-08-24, 09:32
Problem with DXVA scaling videos - by obstler - 2018-10-27, 10:13
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