I have a Dell XPS 13 with Ubuntu 18.04 installed. I have the install encrypted and when I get to the encryption password prompt the keyboard works fine, then when I get to the login screen keyboard is unresponsive. Brightness/backlight keys work, but most other things do nothing. I noticed if I put the laptop to sleep at the login screen, after waking it up the keyboard works as expected.

I've tried sudo apt-get install --reinstall xserver-xorg-input-all with no luck.


I've determined this is related to the model having a tablet mode (Dell XPS 15 9575), it disables keyboard when the screen is flipped back. Ubuntu doesn't seem to handle this well and disables by default.


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