Add the rt linux 4.1.3-rt3 as base

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

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+What:          /sys/devices/.../power_state
+Date:          January 2013
+Contact:       Rafael J. Wysocki <rafael.j.wysocki@intel.com>
+Description:
+               The /sys/devices/.../power_state attribute is only present for
+               device objects representing ACPI device nodes that provide power
+               management methods.
+
+               If present, it contains a string representing the current ACPI
+               power state of the given device node.  Its possible values,
+               "D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state
+               names defined by the ACPI specification (ACPI 4 and above).
+
+               If the device node uses shared ACPI power resources, this state
+               determines a list of power resources required not to be turned
+               off.  However, some power resources needed by the device node in
+               higher-power (lower-number) states may also be ON because of
+               some other devices using them at the moment.
+
+               This attribute is read-only.