the message appears in the logs. It was tracked down to the script /usr/share/laptop-mode-tools/modules/hdparm Line 44 read: if [ -x /sbin/udevadm ]; then while udevadm is in /bin/udevadm when provided by sys-apps/systemd-204 thanks https://bbs.archlinux.org/viewtopic.php?id=135665 for troubleshooting.
This has already been fixed in 1.64, please re-open if not.