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0f7b58d
(Get the code!)
Thanks for pointing that out. I was wondering why so many adapters/cables for sale only mention "USB" while also claiming to do 4K60Hz...
https:/
So Thunderbolt isn't required, only USB 3.1 Alternate Mode and a powerful (probably only *integrated*) GPU that can link to it.
You might have hit some kind of bandwidth limitation using both USB-C ports at once. Although that doesn't make sense at Thunderbolt 3 speeds, it would make sense at USB speeds. And even if USB 3.1 speeds are being surpassed to support Alternate Mode your chipset/GPU might only know how to do it on one port at a time. So this might not be fixable...
Also remember to try 'Ubuntu on Wayland' which uses a completely different code path for all this.