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1What: /sys/devices/.../power_state2Date: January 20133Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com>4Description:5 The /sys/devices/.../power_state attribute is only present for6 device objects representing ACPI device nodes that provide power7 management methods.8 9 If present, it contains a string representing the current ACPI10 power state of the given device node. Its possible values,11 "D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state12 names defined by the ACPI specification (ACPI 4 and above).13 14 If the device node uses shared ACPI power resources, this state15 determines a list of power resources required not to be turned16 off. However, some power resources needed by the device node in17 higher-power (lower-number) states may also be ON because of18 some other devices using them at the moment.19 20 This attribute is read-only.21