1836aedb1SRafael J. WysockiWhat: /sys/devices/.../real_power_state 2836aedb1SRafael J. WysockiDate: January 2013 3836aedb1SRafael J. WysockiContact: Rafael J. Wysocki <rafael.j.wysocki@intel.com> 4836aedb1SRafael J. WysockiDescription: 5836aedb1SRafael J. Wysocki The /sys/devices/.../real_power_state attribute is only present 6836aedb1SRafael J. Wysocki for device objects representing ACPI device nodes that provide 7836aedb1SRafael J. Wysocki power management methods and use ACPI power resources for power 8836aedb1SRafael J. Wysocki management. 9836aedb1SRafael J. Wysocki 10836aedb1SRafael J. Wysocki If present, it contains a string representing the real ACPI 11836aedb1SRafael J. Wysocki power state of the given device node as returned by the _PSC 12836aedb1SRafael J. Wysocki control method or inferred from the configuration of power 13836aedb1SRafael J. Wysocki resources. Its possible values, "D0", "D1", "D2", "D3hot", and 14836aedb1SRafael J. Wysocki "D3cold", reflect the power state names defined by the ACPI 15836aedb1SRafael J. Wysocki specification (ACPI 4 and above). 16836aedb1SRafael J. Wysocki 17836aedb1SRafael J. Wysocki In some situations the value of this attribute may be different 18836aedb1SRafael J. Wysocki from the value of the /sys/devices/.../power_state attribute for 19836aedb1SRafael J. Wysocki the same device object. If that happens, some shared power 20836aedb1SRafael J. Wysocki resources used by the device node are only ON because of some 21836aedb1SRafael J. Wysocki other devices using them at the moment. 22836aedb1SRafael J. Wysocki 23836aedb1SRafael J. Wysocki This attribute is read-only. 24