Maybe just that model? I've got an X1 carbon. It expects 45W and will run from anything that spits out 20V. Even hooked it into a 20W power bank. It complained that the supply was below expectations and that the battery might not charge but it worked.
this post was submitted on 06 Sep 2025
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Hmmm, it does switch to 20V when something is connected to the adapters USB-A, but will keep restarting (the adapter).
https://www.reddit.com/r/thinkpad/comments/lavqip/charging_issues_with_tp_l390_yoga_solved/
Seen the PD firmware me toned in other forums as well.
Probably an Apple like chip to check the originality of the charging solution you’re connecting to it. Everything else is treated as a “bad idea” or something.