162306a36Sopenharmony_ciWhat: /sys/devices/.../real_power_state 262306a36Sopenharmony_ciDate: January 2013 362306a36Sopenharmony_ciContact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 462306a36Sopenharmony_ciDescription: 562306a36Sopenharmony_ci The /sys/devices/.../real_power_state attribute is only present 662306a36Sopenharmony_ci for device objects representing ACPI device nodes that provide 762306a36Sopenharmony_ci power management methods and use ACPI power resources for power 862306a36Sopenharmony_ci management. 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci If present, it contains a string representing the real ACPI 1162306a36Sopenharmony_ci power state of the given device node as returned by the _PSC 1262306a36Sopenharmony_ci control method or inferred from the configuration of power 1362306a36Sopenharmony_ci resources. Its possible values, "D0", "D1", "D2", "D3hot", and 1462306a36Sopenharmony_ci "D3cold", reflect the power state names defined by the ACPI 1562306a36Sopenharmony_ci specification (ACPI 4 and above). 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_ci In some situations the value of this attribute may be different 1862306a36Sopenharmony_ci from the value of the /sys/devices/.../power_state attribute for 1962306a36Sopenharmony_ci the same device object. If that happens, some shared power 2062306a36Sopenharmony_ci resources used by the device node are only ON because of some 2162306a36Sopenharmony_ci other devices using them at the moment. 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_ci This attribute is read-only. 24