What: /sys/devices/.../real_power_state Date: January 2013 Contact: Rafael J. Wysocki Description: The /sys/devices/.../real_power_state attribute is only present for device objects representing ACPI device nodes that provide power management methods and use ACPI power resources for power management. If present, it contains a string representing the real ACPI power state of the given device node as returned by the _PSC control method or inferred from the configuration of power resources. Its possible values, "D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state names defined by the ACPI specification (ACPI 4 and above). In some situations the value of this attribute may be different from the value of the /sys/devices/.../power_state attribute for the same device object. If that happens, some shared power resources used by the device node are only ON because of some other devices using them at the moment. This attribute is read-only.