OSDev.org

Hi everyone,
I am going to support ACPI specially for shutdown.
When i was reading i found that there are two types of shutdown : Soft Off (G2/S5) and Mechanical Off (G3).
Now my question is : If i wanted to shutdown the computer and make it safe for the user to unplug the cord , what shutdown state that i should put the computer in ? and when Windows and Linux shutdown the PC , what shutdown state they use ?
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Thanks in advance.

In terms of software the lowest state you can transition a computer to via ACPI is S5. The G3 state has to be done by the user by physical means, for example flipping the switch on the back of the power supply. Generally if someone is going to physically unplug a system it's probably best to prompt them to consult their system's user manual ahead of time too.

Thanks Cognition.