Backstory: Just installed Debian (with desktop environment, basically the default options when you install) and I went through working out the kinks.
1. Screen not found - had to generate new xorg.conf and then startx and it worked.
2. Mouse wasn't moving after startx. Added the package xserver-xorg-input-mouse or w/e and rebooted. Solved that.
3. Last and final hurdle, after it boots to gdm3, keyboard refuses to send any input.
Keyboard works fine in the ctrl+alt+f1 tty.
I'm working on a Sager NP8651 (Laptop) and ran dpkg-reconfigure keyboard-configuration .
There are no options to select for this specific keyboard. If there is a close one that will work, do tell!
Restarted after that and still it didn't work.
Tried running xserver-xorg-input-kbd and it didnt work. Couldn't even find the specified package.