[sow07]

Here's the xrandr dump:  https://paste.kodi.tv/egululegix
dmesg:  https://paste.kodi.tv/neyuguweza
And in case it's useful, a Xorg.0.log:  https://paste.kodi.tv/enamaginos

Also, my TV is not 4K. 

  
nothing jumps out in the logs, compared to my CN62 here. have you tried setting the refresh rate to 59.94 via xrandr? 

Just tried along with a variety of other resolutions and no change.  Strangely the AVR recognizes each resolution after a few seconds of the HDMI symbol blinking (which is a sync indicator by all accounts) and reports it through the setup display, yet can't pass it through.

It's apparently not an EDID issue or else my clone of the working ChromeOS setup would be successful.  Wondering if there are settings which fall outside of EDID or if this is a case of the Ubuntu OS not honoring EDID properly.

I'm stumped.