0001 What: /sys/devices/.../power_state
0002 Date: January 2013
0003 Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
0004 Description:
0005 The /sys/devices/.../power_state attribute is only present for
0006 device objects representing ACPI device nodes that provide power
0007 management methods.
0008
0009 If present, it contains a string representing the current ACPI
0010 power state of the given device node. Its possible values,
0011 "D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state
0012 names defined by the ACPI specification (ACPI 4 and above).
0013
0014 If the device node uses shared ACPI power resources, this state
0015 determines a list of power resources required not to be turned
0016 off. However, some power resources needed by the device node in
0017 higher-power (lower-number) states may also be ON because of
0018 some other devices using them at the moment.
0019
0020 This attribute is read-only.
