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- What: /sys/devices/.../power_state
- Date: January 2013
- Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
- Description:
- The /sys/devices/.../power_state attribute is only present for
- device objects representing ACPI device nodes that provide power
- management methods.
- If present, it contains a string representing the current ACPI
- power state of the given device node. Its possible values,
- "D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state
- names defined by the ACPI specification (ACPI 4 and above).
- If the device node uses shared ACPI power resources, this state
- determines a list of power resources required not to be turned
- off. However, some power resources needed by the device node in
- higher-power (lower-number) states may also be ON because of
- some other devices using them at the moment.
- This attribute is read-only.
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