The laptop in question is a Samsung series 7. The tablet (Turcom 6608) disk installed its own PS/2 keyboard driver among a copious amount of other HID drivers which I think overrode the original one. Uninstalling via device manager doesn't change anything since Win8 update still finds and installs the two keyboards it installed even if it is unplugged. Removing other drivers does not work neither.
Caps lock doesn't light up, FN lock does. No other key responds to anything.