I don’t know if Fedora (or plasma) do things differently but the normal default is that you need sudo to reboot/shutdown/etc.
Then on basically all distros using systemd this behavior is modified via logind session and polkit. So the first thing to look at would be if a shutdown rule exists in /etc/polkit-1/rules.d/ that allow users in a certain group to shutdown/reboot in the first place.
Mine looks like this:
/etc/polkit-1/rules.d/50-shutdown.rules
polkit.addRule(function(action, subject) {
if ((action.id == "shutdown" ||
action.id == "reboot") &&
subject.isInGroup("wheel"))
{
return polkit.Result.YES;
}
});
So every user in the wheel group can do it without password prompt. Without this UI elements for shutdown/reboot will try assuming they have the right but simply fail.




The 800M series is first generation Maxwell architecture, if that is your question (basically slightly upgraded processors from the 700 series rebranded for mobile). All but the early 860M which is still Kepler for some reason. Nvidia numbering is weird.