Re: T420 - USB ports stop working after undocking and re-docking 11-26-2013 09:17 AM To "Fix" this (meaning I don't have root cause but agree it seems to only occur when you've recently undocked), open Device Manager, Expand out Universal Serial Bus controllers, and then disable and re-enable the first listed Generic USB Hub (Port_#0001.Hub_#0002).
articolo trovato sul forum lenovo btw: la domanda era per un T420 ma la soluzione proposta è andata bene anche a me con un x230
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