| 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. |
