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Based on kernel version 3.16. Page generated on 2014-08-06 21:35 EST.

1	What:		/sys/devices/.../power_state
2	Date:		January 2013
3	Contact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
4	Description:
5			The /sys/devices/.../power_state attribute is only present for
6			device objects representing ACPI device nodes that provide power
7			management methods.
8	
9			If present, it contains a string representing the current ACPI
10			power state of the given device node.  Its possible values,
11			"D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state
12			names defined by the ACPI specification (ACPI 4 and above).
13	
14			If the device node uses shared ACPI power resources, this state
15			determines a list of power resources required not to be turned
16			off.  However, some power resources needed by the device node in
17			higher-power (lower-number) states may also be ON because of
18			some other devices using them at the moment.
19	
20			This attribute is read-only.
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