| What: /sys/devices/.../real_power_state | |
| Date: January 2013 | |
| Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
| 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. |