Advanced Configuration and Power Interface

In computing, the Advanced Configuration and Power Interface (ACPI) specification provides an open standard that the operating systems can use to perform discovery and configuration of computer hardware components, to perform power management by, for example, putting unused components to sleep, and to do status monitoring. Internally, ACPI advertises the available components and their functionalities to the operating system kernel using instruction lists ("methods") provided through the system firmware (UEFI or BIOS), which the kernel parses and then executes the desired operations (such as the initialization of hardware components) using an embedded minimalistic virtual machine.