the worst part is that the protocol is fully capable of letting you see what's wrong here, but neither OS, nor firmware, nor even the USB PD controller will easily divulge this information.
I just spent over an hour trying to figure out why the heck my thunderbolt dock stopped working. Pro tip: Actually plug the thunderbolt cable in the thunderbolt capable USB-C port, not the USB-only port. 
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At least for ChromeOS this should be fixable, ditto MacOS
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lsusb --vvv
Thanks. Twitter will use this to make your timeline better. UndoUndo
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