1. A computer-implemented method for providing Advanced Configuration and Power Interface (ACPI) sleep-state support in a computing device equipped with a central processing unit (CPU), comprising: triggering a CPU-only reset for the computing device as a result of an operating system for the computing device determining to enter a specified sleep-state, the CPU-only reset triggered for the computing device instead of the computing device immediately entering into the specified sleep-state; executing firmware code based on the triggered CPU-only reset; and entering the specified sleep-state at an end of execution of the firmware code.