Enabling automatic time update is just works for one session. After a restart, nothing happens because ntpd.service is remained disabled. systemctl status ntpd.service ntpd.service - Network Time Service Loaded: loaded (/usr/lib/systemd/system/ntpd.service; disabled) Active: inactive (dead) CGroup: name=systemd:/system/ntpd.service Reproducible: Always Steps to Reproduce: 1. easy, just try to enable / disable the automatic update, than do a restart Actual Results: Manualy giving out the sudo systemctl enable ntpd.service command starts the ntpd service. systemctl status ntpd.service ntpd.service - Network Time Service Loaded: loaded (/usr/lib/systemd/system/ntpd.service; enabled) Active: active (running) since Mon, 29 Oct 2012 14:44:41 +0100 Process: 278 ExecStart=/usr/bin/ntpd $NTPD_ARGS -p /run/ntpd.pid (code=exited, status=0/SUCCESS) Main PID: 283 (ntpd) CGroup: name=systemd:/system/ntpd.service └ 283 /usr/bin/ntpd -g -p /run/ntpd.pid About five minutes after a restart, the NTPD updates the clock Expected Results: Start the ntpd.service automaticly withouth manual intervention. BTW, why takes 5+ minutes to the ntpd for update the time?
You misunderstand the intention of that option. It means " I don't bother correcting the date/time manually myself, so run ntpdate to contanct a time server and update the date/time for me after I click the apply button." . It is designed to perform a one-shot operation, not designed to manage the ntpd service on your system.
The option shall do the least surprising, most functional, thing: enabling the network time protocol. https://bugs.kde.org/show_bug.cgi?id=444821