Comment 36 for bug 1201180

I can confirm that systemd logind is in control of the power button on my ASUS UX305 laptop as of Kubuntu 15.04. This means that no matter what the settings in KDE system-settings the power button is handled by logind.

Since the power button is right above backspace and I often hit the backspace key (and have accidentally shut off my laptop several times) I have changed the line in /etc/systemd/logind.conf to:
HandlePowerKey=ignore

This renders the power key useless, but that is better then accidentally shutting my computer off in the middle of typing.

If logind is going to "handle" the power key, maybe system-settings should deal with logind and not acpi or whatever else system-settings is trying modify to get configuration control of the power key?