on my X60T and X61 tablet notebooks with windows 7, they keyboard stopps working any time I use the "switch user" method to log on. If I use the on screen keyboard to log back in to the original user account, the keyboard starts working agian, but not for any other account. Also, if I reboot, the keyboard starts working again. This is a problem on all of our X60T and X61 tablet notebooks.
After this, please restart the Notebook and check if the issue resolved.
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I know it's a year later have updated bios through Lenovo system update each time one was available. Problem persists. We also purchaced some X230Ts. They have the same problem. When we use "switch user," the keyboard doesn't work untill we switch back and log out. (usb attached keyboard often will work.)