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2. ACPI - Wikipedia

   en.wikipedia.org/wiki/ACPI

   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.

3. Platform Controller Hub - Wikipedia

   en.wikipedia.org/wiki/Platform_Controller_Hub

   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.

4. High Precision Event Timer - Wikipedia

   en.wikipedia.org/wiki/High_Precision_Event_Timer

   The High Precision Event Timer (HPET) is a hardware timer available in modern x86-compatible personal computers.Compared to older types of timers available in the x86 architecture, HPET allows more efficient processing of highly timing-sensitive applications, such as multimedia playback and OS task switching.