Conclusion

Well, I know there are just too many states in ACPI. Maybe you are still blur about the relationship between various states. Here's the big picture :

ACPI is a very well-defined interface. There are many power states to select, so a well-designed operating system can deliver the best power-performance balance at any particular time. Its implementation is also robust because only privilege code (the operating system) can use its power management features. This can prevent malicious software from exploiting and controlling the hardware directly.

Note : This guide was based on the following article.

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