For a Lenovo laptop that uses M.2 WLAN card, there are many cases:
1, Ivy Bridge based ThinkPad, namely X230s and T431s. There is no Boot Guard so the whitelist restrictions can be removed. They have coreboot implementations.
2, Normal-voltage Haswell based ThinkPad, including L440, L540, T440p, T540p, W540 and W541. There is no Boot Guard so the whitelist restrictions can be removed. Some of said models have coreboot implementations.
3, Ultra-low-voltage Haswell based ThinkPad Edge, namely S and E series. They support Boot Guard but probably not enabled (by burning the programming fuse). It's theoretically possible to support coreboot, and we are working on them. For example, I have one S1 Yoga without Boot Guard enabled.
4, Ultra-low-voltage Haswell based ThinkPad (non-Edge) series, including X240/s, T440/s, and X1 Carbon 2nd. They have Boot Guard enabled so it's impossible to modify the firmware and you won't be able to use AR9462 on them.
5, Broadwell based ThinkPad. They have Boot Guard enabled. You won't be able to use AR9462 on them.
6, Skylake or newer ThinkPad. They have Boot Guard enabled. But it appears that they no longer impose restrictions on WLAN cards. I have a P50 and installed an AR9462 in it.
7. IdeaPad or other product lines. I don't use such series, but it seems that not all of them have whitelist restrictions.
Therefore it's still possible to make use of the AR9462 card, as long as your computer doesn't have Boot Guard.
