From the Thinkpads I have seen and used (last one in 2023) I haven't yet seen one that is "fully supported" out of the box on Linux and all of them required some degree of tinkering.
By the way Arch wiki has a nice overview on configuring power saving properly, in case you ever need it in the future: https://wiki.archlinux.org/title/Power_management
Yes, that is my limited experience with Thinkpad as well.
This don't ship with Linux and are not Linux Hardware. They're Windows hardware.