Edit: this guide doesn’t seem to mention it https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/thinkpad-t-series-laptops/thinkpad-t480-type-20l5-20l6/20l6/20l6s01q2y/document-userguide

I was flashing Libreboot on to my ThinkPad T480, when I noticed this little button. Sorry for the poor images!

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[–] 2 points 7 months ago

Scribd has the schematic of the board, but I'm not technical enough to use it and answer your question.
https://www.scribd.com/document/619356079/Lenovo-ThinkPad-T480-01YR328-NM-B501-rev0-1

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