1 What:		/sys/devices/.../real_power_state
2 Date:		January 2013
3 Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
4 Description:
5 		The /sys/devices/.../real_power_state attribute is only present
6 		for device objects representing ACPI device nodes that provide
7 		power management methods and use ACPI power resources for power
8 		management.
9 
10 		If present, it contains a string representing the real ACPI
11 		power state of the given device node as returned by the _PSC
12 		control method or inferred from the configuration of power
13 		resources.  Its possible values, "D0", "D1", "D2", "D3hot", and
14 		"D3cold", reflect the power state names defined by the ACPI
15 		specification (ACPI 4 and above).
16 
17 		In some situations the value of this attribute may be different
18 		from the value of the /sys/devices/.../power_state attribute for
19 		the same device object.  If that happens, some shared power
20 		resources used by the device node are only ON because of some
21 		other devices using them at the moment.
22 
23 		This attribute is read-only.
24