I’ve just set up my new 12th gen batch 3 laptop and the built-in keyboard doesn’t seem to work. I’ve followed the recommended steps to resolve this without success. (My keyboard isn't working).
Using an external keyboard I booted into an Ubuntu live os. And the touchpad works, but not the built-in keyboard.
I tried reseating the connector yesterday, and I’ve just double checked, the connector is inserted correctly and the latch is down. Also, the touchpad works fine, but the keyboard doesn’t work at all.
I am having a similar issue where instead of the Keyboard, the lid sensor stopped working once I upgraded to the 12th gen Mainboard. The connections are fine and everything else works flawlessly (fingerprint reader, keyboard, touchpad) but the lid sensor stopped working.