Solved! Laptop keyboard stops working whenever AC is unplugged

Jul 15, 2018
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The integrated keyboard on my Dell Latitude E6440 stops working as soon as the AC adapter is unplugged. If the AC is reconnected is still doesn't work, though a USB keyboard is fine. After flashing the bios with the bios update from the dell website, it works again. I'm totally confused. Does anyone have any suggestions?
 
Jul 15, 2018
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But the problem is if I unplug the AC the keyboard stops working again, until I re-run the update.
 
Jul 15, 2018
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Yep, I've tried that too. The cmos battery reads 3V on my multimeter and the system clock stays set when the AC and Li battery are both disconnected.
 
Jul 15, 2018
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Yes, I was thinking to try a live distro, although I expect it will be the same in Linux as the bios menu is affected. I did buy a new battery not long ago although it seems to work fine otherwise.
 
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