A strange Thinkpad thing...computer stacking puts keyboards into comas

Started 4 months ago | Discussions thread
OP RDKirk Forum Pro • Posts: 16,540
Answer found: The Hall Sensor Card

The computers have a little magnet switch in the front right edge of the lower chassis. That card apparently switches off the keyboard when the lid is closed or turned fully back into tablet position.
So, when they are stacked, the hall sensor card of the computer below is affecting the computer above.

Moving the top computer off the stack--or even turning it 90 degrees while on the stack--allows the keyboard to switch back on.

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