Commit | Line | Data |
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836aedb1 RW |
1 | What: /sys/devices/.../real_power_state |
2 | Date: January 2013 | |
3 | Contact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> | |
4 | Description: | |
5 | The /sys/devices/.../real_power_state attribute is only present | |
6 | for device objects representing ACPI device nodes that provide | |
7 | power management methods and use ACPI power resources for power | |
8 | management. | |
9 | ||
10 | If present, it contains a string representing the real ACPI | |
11 | power state of the given device node as returned by the _PSC | |
12 | control method or inferred from the configuration of power | |
13 | resources. Its possible values, "D0", "D1", "D2", "D3hot", and | |
14 | "D3cold", reflect the power state names defined by the ACPI | |
15 | specification (ACPI 4 and above). | |
16 | ||
17 | In some situations the value of this attribute may be different | |
18 | from the value of the /sys/devices/.../power_state attribute for | |
19 | the same device object. If that happens, some shared power | |
20 | resources used by the device node are only ON because of some | |
21 | other devices using them at the moment. | |
22 | ||
23 | This attribute is read-only. |