The trackpoint and trackpad continue to work in this fault condition. And most of the time, some of hotkeys (microphone mute) continue to respond, even though the rest of the keyboard (caps lock, num lock, normal keys) do not seem to register. I can always plug in a USB keyboard and I will be able to type. Sometimes the act of plugging in a USB keyboard will cause the internal keyboard to respond, but not always.
I've also tried re-seating the ribbon cables from the keyboard, but that has not solved the problem. The problem occurs even with Windows 10 in safe mode.
Has anyone experienced this kind of problem or have any suggestions? It's intermittent, so I'm hesitant to contact Lenovo Support because it may or may not show up when they are observing it.
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Considering more Thinkpads. Retiring my X200T. PM me if anyone wants to home it.
OS: Ubuntu and Windows 10.
The keyboard issues occurred in both Windows and Linux, so perhaps it was a problem with the embedded controller or its firmware? I could only load the latest BIOS firmware (v1.30) and the previous one (v1.29*), both of which use embedded controller program (ECP) version 1.16. I am not sure if the firmware updater would reflash the embedded controller if the ECP version does not change. The problem was present with both firmware releases on the old system board.
(*) Note: After installing BIOS v1.29, the installer is no longer able to roll back to earlier versions.
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