Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / ABI / testing / sysfs-devices-real_power_state

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+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.