what about this error? 
systemctl enable acpid.service
Keep in mind one thing, enlightenment is not an easy window manager, it has its tricks and often leaves you stranded.
Maybe that makes him more attractive 
[tiger@tiger-pc ~]$ systemctl enable acpid.service
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-unit-files ====
Authentication is required to manage system service or unit files.
Authenticating as: tiger
Password:
==== AUTHENTICATION COMPLETE ====
Failed to enable unit: Unit file acpid.service does not exist.
[tiger@tiger-pc ~]$
systemctl status acpid.service
?
yep.
Probably need to install package acpid
acpid error 
Try this:
sudo pacman -S acpid
Does it give any more clue about the error?
done! 
…