But in asian country, most power plug come with an on-off switch. We can
totally cut off the power supply but turn it off, without having to
unplug.
Here in the UK some computer power supplies have switches on the back, some
don't. Obviously, by using that switch, you can disconnect the power
completely, but it isn't very convenient to reach behind the box each time.
Similarly with wall sockets - some have switches and some don't.
My point was that - on the computers I've measured - there is no difference
in power consumption between 'standby' and 'off', UNLESS you disconnect the
mains supply using the switch on the back, or unplug it, neither of which
are convenient.
Therefore I stand by my assertion: for desktop machines, forget about
hibernate, and use hybrid sleep instead. I do accept that this may be
different for laptops, as Chirag points out.
SteveT