162306a36Sopenharmony_ciWhat:		/sys/devices/.../power_state
262306a36Sopenharmony_ciDate:		January 2013
362306a36Sopenharmony_ciContact:	Rafael J. Wysocki <rafael.j.wysocki@intel.com>
462306a36Sopenharmony_ciDescription:
562306a36Sopenharmony_ci		The /sys/devices/.../power_state attribute is only present for
662306a36Sopenharmony_ci		device objects representing ACPI device nodes that provide power
762306a36Sopenharmony_ci		management methods.
862306a36Sopenharmony_ci
962306a36Sopenharmony_ci		If present, it contains a string representing the current ACPI
1062306a36Sopenharmony_ci		power state of the given device node.  Its possible values,
1162306a36Sopenharmony_ci		"D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state
1262306a36Sopenharmony_ci		names defined by the ACPI specification (ACPI 4 and above).
1362306a36Sopenharmony_ci
1462306a36Sopenharmony_ci		If the device node uses shared ACPI power resources, this state
1562306a36Sopenharmony_ci		determines a list of power resources required not to be turned
1662306a36Sopenharmony_ci		off.  However, some power resources needed by the device node in
1762306a36Sopenharmony_ci		higher-power (lower-number) states may also be ON because of
1862306a36Sopenharmony_ci		some other devices using them at the moment.
1962306a36Sopenharmony_ci
2062306a36Sopenharmony_ci		This attribute is read-only.
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