| Rafael J. Wysocki | 836aedb | 2013-01-24 12:49:59 +0100 | [diff] [blame] | 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. |