Questions that relate to the Advanced Configuration and Power Interface (ACPI) specification which provides an open standard for device configuration and power management by the operating system.

acpid is a flexible and extensible daemon for delivering ACPI events. These events are triggered by certain actions, such as:

Pressing the Power button
Pressing the Sleep/Suspend button
Closing a notebook lid
(Un)Plugging an AC power adapter from a notebook 

acpid can be used by itself, or combined with a more robust system such as Pm-utils and Cpufrequtils to provide a more complete power management solution.

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