A:Answer Answering my own question now that it has arrived:
20V/2.25A, 15V/3A, 9V/2A, 5V/2A . That's weak power output at 5V and 9V.
Also, the power adapter is annoying: it has a three-prong plug, and it's on a separate cable to the brick. Other laptops I've seen that charge via USB-C come with a power brick with two-prong power plugs which flip out.