0001 What: /sys/devices/.../real_power_state
0002 Date: January 2013
0003 Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
0004 Description:
0005 The /sys/devices/.../real_power_state attribute is only present
0006 for device objects representing ACPI device nodes that provide
0007 power management methods and use ACPI power resources for power
0008 management.
0009
0010 If present, it contains a string representing the real ACPI
0011 power state of the given device node as returned by the _PSC
0012 control method or inferred from the configuration of power
0013 resources. Its possible values, "D0", "D1", "D2", "D3hot", and
0014 "D3cold", reflect the power state names defined by the ACPI
0015 specification (ACPI 4 and above).
0016
0017 In some situations the value of this attribute may be different
0018 from the value of the /sys/devices/.../power_state attribute for
0019 the same device object. If that happens, some shared power
0020 resources used by the device node are only ON because of some
0021 other devices using them at the moment.
0022
0023 This attribute is read-only.
