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Keyboard stops working when AC unplugged, BIOS flash fixes

The built in keyboard on my laptop stops working as soon as the AC adapter is unplugged. It still doesn't work after reconnecting the power. However, running a BIOS update from the driver download section fixes the problem.

External USB keyboards are not affected, and neither is the pointer controller in the middle of the keyboard. The laptop is a Latitude E6440.

Any suggestions?

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