18c2ecf20Sopenharmony_ciWhat: /sys/devices/.../real_power_state 28c2ecf20Sopenharmony_ciDate: January 2013 38c2ecf20Sopenharmony_ciContact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 48c2ecf20Sopenharmony_ciDescription: 58c2ecf20Sopenharmony_ci The /sys/devices/.../real_power_state attribute is only present 68c2ecf20Sopenharmony_ci for device objects representing ACPI device nodes that provide 78c2ecf20Sopenharmony_ci power management methods and use ACPI power resources for power 88c2ecf20Sopenharmony_ci management. 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci If present, it contains a string representing the real ACPI 118c2ecf20Sopenharmony_ci power state of the given device node as returned by the _PSC 128c2ecf20Sopenharmony_ci control method or inferred from the configuration of power 138c2ecf20Sopenharmony_ci resources. Its possible values, "D0", "D1", "D2", "D3hot", and 148c2ecf20Sopenharmony_ci "D3cold", reflect the power state names defined by the ACPI 158c2ecf20Sopenharmony_ci specification (ACPI 4 and above). 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ci In some situations the value of this attribute may be different 188c2ecf20Sopenharmony_ci from the value of the /sys/devices/.../power_state attribute for 198c2ecf20Sopenharmony_ci the same device object. If that happens, some shared power 208c2ecf20Sopenharmony_ci resources used by the device node are only ON because of some 218c2ecf20Sopenharmony_ci other devices using them at the moment. 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci This attribute is read-only. 24