Lenovo Thinkpad T420

After proper configuration, every part of the Thinkpad T420 is Linux friendly.

Firmware
The Linux firmware package is needed since the Centrino Advanced-N 6205 AGN wifi adapter requires a specific firmware file.

The only file that is needed is the firmware file. It must be compiled directly into the kernel binary. Obtain the file by installing the Linux firmware package:

Kernel
For a pre-built, hand-selected, Gentoo specific .config file: 4.9.0

External resources

 * http://www.thinkwiki.org/wiki/Installing_Gentoo_on_a_ThinkPad_T420 - Another guide to installing Gentoo on the T420.