1836aedb1SRafael J. WysockiWhat:		/sys/devices/.../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/.../power_state attribute is only present for
6836aedb1SRafael J. Wysocki		device objects representing ACPI device nodes that provide power
7836aedb1SRafael J. Wysocki		management methods.
8836aedb1SRafael J. Wysocki
9836aedb1SRafael J. Wysocki		If present, it contains a string representing the current ACPI
10836aedb1SRafael J. Wysocki		power state of the given device node.  Its possible values,
11836aedb1SRafael J. Wysocki		"D0", "D1", "D2", "D3hot", and "D3cold", reflect the power state
12836aedb1SRafael J. Wysocki		names defined by the ACPI specification (ACPI 4 and above).
13836aedb1SRafael J. Wysocki
14836aedb1SRafael J. Wysocki		If the device node uses shared ACPI power resources, this state
15836aedb1SRafael J. Wysocki		determines a list of power resources required not to be turned
16836aedb1SRafael J. Wysocki		off.  However, some power resources needed by the device node in
17836aedb1SRafael J. Wysocki		higher-power (lower-number) states may also be ON because of
18836aedb1SRafael J. Wysocki		some other devices using them at the moment.
19836aedb1SRafael J. Wysocki
20836aedb1SRafael J. Wysocki		This attribute is read-only.
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