Recently I've installed macOS 10.12.6 (Sierra) on my ThinkPad X201, and I could get everything working, except for the brightness.
I can't make it work, I've applied a bunch of patches on DSDT and couldn't get working, so I decided to apply these patches in SSDT and... I couldn't get working as well.
After a while doing some search I realize that for macOS 10.12.4 and above, the patches that I was applying doesn't work, and I would have to use the AppleBacklightInjector kext patch.
I've tried the kext patch and doesn't work too. Am I doing something wrong? or my system doesn't support MacOS brightness control at all?