1 What: /sys/devices/.../power/
2 Date: January 2009
3 Contact: Rafael J. Wysocki <rjw@rjwysock
4 Description:
5 The /sys/devices/.../power dir
6 allowing the user space to che
7 management related properties
8
9 What: /sys/devices/.../power/wakeup
10 Date: January 2009
11 Contact: Rafael J. Wysocki <rjw@rjwysock
12 Description:
13 The /sys/devices/.../power/wak
14 space to check if the device i
15 from sleep states, such as the
16 RAM) and hibernation (suspend
17 it to do that as desired.
18
19 Some devices support "wakeup"
20 used to activate the system fr
21 have one of the following two
22 file:
23
24 + "enabled\n" to issue the eve
25 + "disabled\n" not to do so;
26
27 In that cases the user space c
28 by the contents of this file b
29 "disabled" to it.
30
31 For the devices that are not c
32 events this file is not presen
33 be enabled to wake up the syst
34
35 What: /sys/devices/.../power/control
36 Date: January 2009
37 Contact: Rafael J. Wysocki <rjw@rjwysock
38 Description:
39 The /sys/devices/.../power/con
40 space to control the run-time
41
42 All devices have one of the fo
43 power/control file:
44
45 + "auto\n" to allow the device
46 + "on\n" to prevent the device
47
48 The default for all devices is
49 be subject to automatic power
50 drivers. Changing this attrib
51 from power managing the device
52 the device is suspended causes
53
54 What: /sys/devices/.../power/async
55 Date: January 2009
56 Contact: Rafael J. Wysocki <rjw@rjwysock
57 Description:
58 The /sys/devices/.../async att
59 enable or diasble the device's
60 be executed asynchronously (ie
61 with the main suspend/resume t
62 transitions (eg. suspend to RA
63
64 All devices have one of the fo
65 power/async file:
66
67 + "enabled\n" to permit the as
68 + "disabled\n" to forbid it;
69
70 The value of this attribute ma
71 "enabled", or "disabled" to it
72
73 It generally is unsafe to perm
74 of a device unless it is certa
75 of the device are known to the
76 devices this attribute is set
77 device drivers and in that cas
78 default value.
79
80 What: /sys/devices/.../power/wakeup_
81 Date: September 2010
82 Contact: Rafael J. Wysocki <rjw@rjwysock
83 Description:
84 The /sys/devices/.../wakeup_co
85 of signaled wakeup events asso
86 attribute is read-only. If th
87 the system from sleep states,
88 If the device is not enabled t
89 states, this attribute is empt
90
91 What: /sys/devices/.../power/wakeup_
92 Date: September 2010
93 Contact: Rafael J. Wysocki <rjw@rjwysock
94 Description:
95 The /sys/devices/.../wakeup_ac
96 number of times the processing
97 the device was completed (at t
98 is read-only. If the device i
99 system from sleep states, this
100 the device is not enabled to w
101 states, this attribute is empt
102
103 What: /sys/devices/.../power/wakeup_
104 Date: February 2012
105 Contact: Rafael J. Wysocki <rjw@rjwysock
106 Description:
107 The /sys/devices/.../wakeup_ab
108 number of times the processing
109 the device might have aborted
110 state in progress. This attri
111 is not capable to wake up the
112 attribute is not present. If
113 up the system from sleep state
114
115 What: /sys/devices/.../power/wakeup_
116 Date: February 2012
117 Contact: Rafael J. Wysocki <rjw@rjwysock
118 Description:
119 The /sys/devices/.../wakeup_ex
120 number of times a wakeup event
121 been reported with a timeout t
122 read-only. If the device is n
123 from sleep states, this attrib
124 device is not enabled to wake
125 this attribute is empty.
126
127 What: /sys/devices/.../power/wakeup_
128 Date: September 2010
129 Contact: Rafael J. Wysocki <rjw@rjwysock
130 Description:
131 The /sys/devices/.../wakeup_ac
132 or 0, depending on whether or
133 the device is being processed
134 If the device is not capable t
135 states, this attribute is not
136 enabled to wake up the system
137 is empty.
138
139 What: /sys/devices/.../power/wakeup_
140 Date: September 2010
141 Contact: Rafael J. Wysocki <rjw@rjwysock
142 Description:
143 The /sys/devices/.../wakeup_to
144 the total time of processing w
145 device, in milliseconds. This
146 device is not capable to wake
147 this attribute is not present.
148 wake up the system from sleep
149
150 What: /sys/devices/.../power/wakeup_
151 Date: September 2010
152 Contact: Rafael J. Wysocki <rjw@rjwysock
153 Description:
154 The /sys/devices/.../wakeup_ma
155 the maximum time of processing
156 with the device, in millisecon
157 If the device is not capable t
158 states, this attribute is not
159 enabled to wake up the system
160 is empty.
161
162 What: /sys/devices/.../power/wakeup_
163 Date: September 2010
164 Contact: Rafael J. Wysocki <rjw@rjwysock
165 Description:
166 The /sys/devices/.../wakeup_la
167 the value of the monotonic clo
168 signaling the last wakeup even
169 milliseconds. This attribute
170 not enabled to wake up the sys
171 attribute is not present. If
172 up the system from sleep state
173
174 What: /sys/devices/.../power/wakeup_
175 Date: February 2012
176 Contact: Rafael J. Wysocki <rjw@rjwysock
177 Description:
178 The /sys/devices/.../wakeup_pr
179 contains the total time the de
180 opportunistic transitions to s
181 This attribute is read-only.
182 wake up the system from sleep
183 present. If the device is not
184 from sleep states, this attrib
185
186 What: /sys/devices/.../power/autosus
187 Date: September 2010
188 Contact: Alan Stern <stern@rowland.harva
189 Description:
190 The /sys/devices/.../power/aut
191 contains the autosuspend delay
192 drivers do not want their devi
193 becomes idle at run time; they
194 inactive for a certain minimum
195 period is called the autosuspe
196 prevent the device from being
197 to writing "on" to the power/c
198 1000 will cause the autosuspen
199 up to the nearest second.
200
201 Not all drivers support this a
202 attempts to read or write it w
203
204 What: /sys/devices/.../power/pm_qos_
205 Date: March 2012
206 Contact: Rafael J. Wysocki <rjw@rjwysock
207 Description:
208 The /sys/devices/.../power/pm_
209 contains the PM QoS resume lat
210 which is the maximum allowed t
211 device, after it has been susp
212 request to the moment the devi
213 in microseconds. If it is equ
214 the PM QoS resume latency may
215 "n/a" means that user space ca
216 all for the given device.
217
218 Not all drivers support this a
219 it is not present.
220
221 This attribute has no effect o
222 hibernation.
223
224 What: /sys/devices/.../power/pm_qos_
225 Date: January 2014
226 Contact: Rafael J. Wysocki <rjw@rjwysock
227 Description:
228 The /sys/devices/.../power/pm_
229 contains the PM QoS active sta
230 given device in microseconds.
231 latency the device can suffer
232 effects on user space function
233 string "any", the latency does
234 but hardware should not be all
235 for the device automatically.
236
237 Reading "auto" from this file
238 access latency for the device
239 by the hardware as needed. Wr
240 hardware to be switched to thi
241 latency tolerance requirements
242
243 This attribute is only present
244 is supported by the hardware.
245
246 This attribute has no effect o
247 devices and on system-wide sus
248
249 What: /sys/devices/.../power/pm_qos_
250 Date: September 2012
251 Contact: Rafael J. Wysocki <rjw@rjwysock
252 Description:
253 The /sys/devices/.../power/pm_
254 is used for manipulating the P
255 set, this flag indicates to th
256 be removed entirely from the d
257
258 Not all drivers support this a
259 it is not present.
260
261 This attribute has no effect o
262 hibernation.
263
264 What: /sys/devices/.../power/runtime
265 Date: April 2010
266 Contact: Rafael J. Wysocki <rjw@rjwysock
267 Description:
268 The /sys/devices/.../power/run
269 the current runtime PM status
270 "suspended", "suspending", "re
271 error), or "unsupported" (runt
272
273 What: /sys/devices/.../power/runtime
274 Date: Jul 2010
275 Contact: Arjan van de Ven <arjan@linux.i
276 Description:
277 Reports the total time that th
278 Used for runtime PM statistics
279
280 What: /sys/devices/.../power/runtime
281 Date: Jul 2010
282 Contact: Arjan van de Ven <arjan@linux.i
283 Description:
284 Reports total time that the de
285 Used for runtime PM statistics
286
287 What: /sys/devices/.../power/runtime
288 Date: Apr 2010
289 Contact: Dominik Brodowski <linux@domini
290 Description:
291 Reports the runtime PM usage c
292
293 What: /sys/devices/.../power/runtime
294 Date: Apr 2010
295 Contact: Dominik Brodowski <linux@domini
296 Description:
297 Is runtime PM enabled for this
298 States are "enabled", "disable
299 combination of the latter two.
300
301 What: /sys/devices/.../power/runtime
302 Date: Apr 2010
303 Contact: Dominik Brodowski <linux@domini
304 Description:
305 Reports the runtime PM childre
306 0 if the children will be igno
307
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