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Advanced Configuration and Power Interface (ACPI) is an open standard that operating systems can use to discover and configure computer hardware components, to perform power management (e.g. putting unused hardware components to sleep), auto configuration (e.g. Plug and Play and hot swapping), and status monitoring.
This can happen when AC power is removed after entering ACPI S4. Applying AC power back and resuming from S4 may result in non detected or even non functioning USB device (erratum 12) Bogus USB ports will be detected by mobile PCH equipped with 6 USB ports (HM55) on the first EHCI controller.
In computing, Intel's Advanced Programmable Interrupt Controller (APIC) is a family of programmable interrupt controllers.As its name suggests, the APIC is more advanced than Intel's 8259 Programmable Interrupt Controller (PIC), particularly enabling the construction of multiprocessor systems.