Disable Laptop Keyboard && Use USB Keyboard Instead ( good for broken laptop keys )

10-evdev.conf

## /etc/X11/xorg.conf.d/10-evdev.conf
## Disable laptop's built-in keyboard (in X session)
## Does not disable on the kernel level
## Does not disable while ctrl+alt+f1 etc
## Useful for placing a USB keyboard on top of laptop's (broken) keyboard as to not accidentally input keys.
## <aerth@riseup.net>
##
## You may have to create the xorg.conf.d directory.
## Something like: 
## mkdir-p /etc/X11/xorg.conf.d

## Here is the contents of /etc/X11/xorg.conf.d/10-evdev.conf

Section "InputClass"
    Identifier          "Built-In Keyboard"
    MatchIsKeyboard     "on"
    MatchProduct        "AT Translated Set 2 keyboard"
    Option              "Ignore" "true"
EndSection