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An [Acronym] for __A__dvanced __C__onfiguration and __P__ower __I__nterface. The newer method for changing devices' power status (eg on standby, hibernating, etc). The older method was [APM] (Advanced Power Management). Some example uses: * spinning down idle hard drives, * telling a monitor to go into lower power mode (but different from [DPMS] for going into standby) * making a machine go into standby or complete hibernation Many newer laptops use [ACPI] exclusively without support for APM. Linux kernel 2.4.x had some support for ACPI, but kernel 2.6 should have much better support. The [ACPI] specification is available [here|http://www.acpi.info/]
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