Looks like it:
simon@laptop:~$ ps aux | grep acpid
root 565 0.0 0.0 0 0 ? S< 15:31 0:00 [ktpacpid]
root 2082 0.0 0.0 4396 1736 ? Ss 15:31 0:00 /usr/sbin/acpid
simon 28534 0.0 0.0 15220 2256 pts/12 S+ 21:04 0:00 grep acpid