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Haha.. I had exactly the same issue. To be fair, the other port is a little hidden since it is also part of a proprietary docking station port.

I am confused. Does only one of them support charging? (I've got one where both can charge, though they don't look the same because one is also thunderbolt)

I think this is their point given this threads question for a humbling learning moment. Both ports support charging but it took someone from outside to get OPs fixed mind off their habitual notion that only a specific port could charge. They did not even try that other port.

The leftmost one is the normal charging port: https://www.reddit.com/r/thinkpad/comments/7fidd0/reminder_l...

The second one is a different design with a different icon. Not clear at all.

IIRC there was a MacBook with two USB-C ports where both could charge, but it would run significantly hotter (and throttle sooner) if the "wrong" one was used.

Haha, I have done this too! Glad I am not alone.