With the arrival of Gnome Shell, one major step has been taken : by default you can't switch-off your computer !
In fact, the only menu available is Suspend. You have to press ALT at the same time to see the Switch-off menu. You will find lots of topics about this strange evolution on the net, with lots of furious people who still want to keep the power of switching off their computer.
But, if you think twice about it, suspend / resume is one of the revolution of modern appliances : who is still switching-off a TV set, a video player or an ADSL box ?
Almost nobody ! Now, you suspend it from your remote. So why not to handle your favorite computer the same way ?
Even if it is consuming a little bit of power, suspend state is having a very strong advantage : it takes almost no time to resume to working condition.
Who is ready to wait for 1 minute or more to check his mails, when 5 seconds are enough to resume a computer with thunderbird already open ?
Under Ubuntu, the only trouble is that your USB input devices (keyboard, mouse, MCE remote, …) are not fully configured by default to be used to resume from a suspend mode.
This guide will explain how to configure your USB input devices to be able to wake-up your suspended computer. As a result, you will be able to wake-up your Ubuntu computer with :
a simple key press on your keyboard
a click on your mouse center button
the power button of your MCE remote
It has been written on a Ubuntu Precise 12.04, but should be applicable with any Linux flavor using a kernel version prior to 3.10.
As USB power management has changed drastically in kernel 3.10 +, this article is not applicable for kernel 3.10+.