[brazen1]

Global support and not just driver support is required for frame packed afaik.  SBS or TAB not sure because in essence they are just two 2D shifted images overlapping.  Without the enable 3D switch on in W10 1909 and every build back to W7, I get no 3D.  So the switch must be offered dependent on the GPU drivers providing it.  madVr provides a .reg that may bypass the global switch going direct to the registry but I'm not sure, never looked.  AMD still offers current drivers and support for 3D btw.  I repacked newer '3D removed' driver installs with the last available individual 3D drivers when first introduced.  They didn't reference with the other newer drivers correctly and failed to function.  I haven't tried your method but it may be fully functional gaming and partial functioning A/V given your symptoms? 

So, I've been using the last 3D driver release that's about 14 months old now.  416.81.  I repacked it with the last perfect HD audio driver that works for me.  388.59.  Everything functions perfect.  This includes display auto switching to the proper 3D mode and 1080p resolution you are struggling with.  I have zero problems using Kodi with these old drivers and this old GPU.  What are your symptoms? 

You didn't provide any specs especially your GPU model.  I use an ancient GPU that has drivers galore.  New GPU's are not driver backward compatible to older models so 3D may be out of the question.  Also consider if you are serious about quality, especially using a PJ, madVr will eventually be in your future if not already so you can get HDR to toned mapped SDR conversions.  Choose your GPU wisely when and if.