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836aedb1 RW |
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. |