Comment # 25 on bug 905988 from Paul Tannington

(In reply to Benjamin Poirier from comment #24)
> (In reply to Paul Tannington from comment #23)
> [...]
> > Try (KDE) Leave -> Turn off computer -- upon restart status is still "d"
> > 
> > Power off completely and upon restart status is now "ug"
> 
> What's the difference between "turn off computer" and "power off completely"?

ATX power supplies are turned on and off by a signal from the motherboard,
initiated either as software generated ("turn off computer", "shutdown -P"), or
by the front panel "Power" button.

While an ATX power supply is connected to the mains supply, it always provides
a 5V standby voltage so that the standby functions on the computer and certain
peripherals are powered.

Power of completely is by removing input (mains) power to the power supply,
either by switch (usually located on the power supply itself) or by
disconnection at the mains socket.