Solution Found: Turns out that it's pretty hard to find a USB-C cable that carries all the signals. Had to go to a Microcenter, and purchase the $15 USB-C 3.1 Gen. 2. cable - in the clearly marked package. Most of the cables, sold over the net, don't give full specs. With the right cable, things work like a charm (well, modulo getting some software configured properly).
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