I agree with Nachlese, you changed something that broke the system, change it back.
Are you 100% sure your keyboard was not working though? a REISUO does not work? [HowTo] reboot / turn off your frozen computer: REISUB/REISUO
I see a plymoth hook in there. Have you tried disabling that in /etc/mkinitcpio.conf and recompiling your kernels with sudo mkinitcpio -P.
Remove it from /etc/default/grub and run sudo update-grub
But I still recommend reverting back to a functioning config.