I posted some pdf’s for the P43s and P53 ThinkPads, but if you’re looking for more information about capability with Lenovo’s and Linux, here are some helpful URL’s where you can find more information on the topic.
Lenovo Linux Forums — https://forums.lenovo.com/linux
Linux Overview — https://support.lenovo.com/us/en/solutions/ht510814
Linux for Personal Systems (this lists all devices that have a Linux Certification) — https://support.lenovo.com/us/en/solutions/pd031426 or https://www.lenovo.com/linux
Linux Certification – What does it mean? — https://support.lenovo.com/us/en/solutions/ht082374
How to Download the Linux Image from the E-support page – https://support.lenovo.com/us/en/solutions/ht511743
Official Lenovo docs / guides relating to running Linux on Thinkpad’s