1What: /sys/devices/.../power_state 2Date: January 2013 3Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 4Description: 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. 21