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Re:ThinkPad X220 MacOS High Sierra Installation by mbreese on Saturday August 04, 2018 @07:59AM (#17686508)
In this article the one of the first steps was replacing the WiFi card. This is a high quality hardware with good developer support. This is exactly the type of hardware you’d want to use.

And the first step was to open up the laptop to swap out a part!?!?!

Re:ThinkPad X220 MacOS High Sierra Installation by gbraad on Saturday August 04, 2018 @08:28AM (#17686598)
Unable to open the article at the moment, but likely it got replaced with a Broadcom. macOS has a very limited set of supported wlan drivers. It is ofcourse not ideal, but understandable (and related to the issue of drivers for macOS in general).
Re:ThinkPad X220 MacOS High Sierra Installation by mbreese on Saturday August 04, 2018 @10:31AM (#17686976)
You’re right... it did.

I’m sure Linux probably supports the built in WiFi card on this laptop too. But I remember having to do just this same thing with an older laptop to get Linux to support the WiFi chip.