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1da177e4 LT |
1 | config PM |
2 | bool "Power Management support" | |
eb7b6b32 | 3 | depends on !IA64_HP_SIM |
1da177e4 LT |
4 | ---help--- |
5 | "Power Management" means that parts of your computer are shut | |
6 | off or put into a power conserving "sleep" mode if they are not | |
7 | being used. There are two competing standards for doing this: APM | |
8 | and ACPI. If you want to use either one, say Y here and then also | |
9 | to the requisite support below. | |
10 | ||
11 | Power Management is most important for battery powered laptop | |
12 | computers; if you have a laptop, check out the Linux Laptop home | |
13 | page on the WWW at <http://www.linux-on-laptops.com/> or | |
14 | Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/> | |
15 | and the Battery Powered Linux mini-HOWTO, available from | |
16 | <http://www.tldp.org/docs.html#howto>. | |
17 | ||
18 | Note that, even if you say N here, Linux on the x86 architecture | |
19 | will issue the hlt instruction if nothing is to be done, thereby | |
20 | sending the processor to sleep and saving power. | |
21 | ||
22 | config PM_DEBUG | |
23 | bool "Power Management Debug Support" | |
24 | depends on PM | |
25 | ---help--- | |
a0349828 BC |
26 | This option enables various debugging support in the Power Management |
27 | code. This is helpful when debugging and reporting PM bugs, like | |
28 | suspend support. | |
29 | ||
5a2eb858 RW |
30 | config PM_ADVANCED_DEBUG |
31 | bool "Extra PM attributes in sysfs for low-level debugging/testing" | |
32 | depends on PM_DEBUG | |
33 | default n | |
34 | ---help--- | |
35 | Add extra sysfs attributes allowing one to access some Power Management | |
36 | fields of device objects from user space. If you are not a kernel | |
37 | developer interested in debugging/testing Power Management, say "no". | |
38 | ||
a0349828 BC |
39 | config PM_VERBOSE |
40 | bool "Verbose Power Management debugging" | |
41 | depends on PM_DEBUG | |
42 | default n | |
43 | ---help--- | |
44 | This option enables verbose messages from the Power Management code. | |
1da177e4 | 45 | |
90dda1cb JB |
46 | config CAN_PM_TRACE |
47 | def_bool y | |
48 | depends on PM_DEBUG && PM_SLEEP && EXPERIMENTAL | |
49 | ||
eb71c87a | 50 | config PM_TRACE |
90dda1cb JB |
51 | bool |
52 | help | |
53 | This enables code to save the last PM event point across | |
54 | reboot. The architecture needs to support this, x86 for | |
55 | example does by saving things in the RTC, see below. | |
56 | ||
57 | The architecture specific code must provide the extern | |
58 | functions from <linux/resume-trace.h> as well as the | |
59 | <asm/resume-trace.h> header with a TRACE_RESUME() macro. | |
60 | ||
61 | The way the information is presented is architecture- | |
62 | dependent, x86 will print the information during a | |
63 | late_initcall. | |
64 | ||
65 | config PM_TRACE_RTC | |
eb71c87a | 66 | bool "Suspend/resume event tracing" |
90dda1cb JB |
67 | depends on CAN_PM_TRACE |
68 | depends on X86 | |
69 | select PM_TRACE | |
5c31f273 | 70 | default n |
eb71c87a LT |
71 | ---help--- |
72 | This enables some cheesy code to save the last PM event point in the | |
73 | RTC across reboots, so that you can debug a machine that just hangs | |
74 | during suspend (or more commonly, during resume). | |
75 | ||
23b168d4 PM |
76 | To use this debugging feature you should attempt to suspend the |
77 | machine, reboot it and then run | |
5c31f273 AM |
78 | |
79 | dmesg -s 1000000 | grep 'hash matches' | |
80 | ||
81 | CAUTION: this option will cause your machine's real-time clock to be | |
82 | set to an invalid time after a resume. | |
83 | ||
f3de4be9 | 84 | config PM_SLEEP_SMP |
296699de | 85 | bool |
801e4062 | 86 | depends on SMP |
f4cb5700 | 87 | depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE |
f3de4be9 | 88 | depends on PM_SLEEP |
ede890c2 | 89 | select HOTPLUG |
296699de RW |
90 | select HOTPLUG_CPU |
91 | default y | |
92 | ||
93 | config PM_SLEEP | |
94 | bool | |
93a0886e | 95 | depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE |
296699de RW |
96 | default y |
97 | ||
5a2eb858 RW |
98 | config PM_SLEEP_ADVANCED_DEBUG |
99 | bool | |
100 | depends on PM_ADVANCED_DEBUG | |
101 | default n | |
102 | ||
dd4c4f17 MG |
103 | config SUSPEND_NVS |
104 | bool | |
105 | ||
296699de RW |
106 | config SUSPEND |
107 | bool "Suspend to RAM and standby" | |
f4cb5700 | 108 | depends on PM && ARCH_SUSPEND_POSSIBLE |
dd4c4f17 | 109 | select SUSPEND_NVS if HAS_IOMEM |
296699de RW |
110 | default y |
111 | ---help--- | |
112 | Allow the system to enter sleep states in which main memory is | |
113 | powered and thus its contents are preserved, such as the | |
f4cb5700 | 114 | suspend-to-RAM state (e.g. the ACPI S3 state). |
296699de | 115 | |
77437fd4 DB |
116 | config PM_TEST_SUSPEND |
117 | bool "Test suspend/resume and wakealarm during bootup" | |
28959742 | 118 | depends on SUSPEND && PM_DEBUG && RTC_CLASS=y |
77437fd4 DB |
119 | ---help--- |
120 | This option will let you suspend your machine during bootup, and | |
121 | make it wake up a few seconds later using an RTC wakeup alarm. | |
122 | Enable this with a kernel parameter like "test_suspend=mem". | |
123 | ||
124 | You probably want to have your system's RTC driver statically | |
125 | linked, ensuring that it's available when this test runs. | |
126 | ||
b28f5081 JB |
127 | config SUSPEND_FREEZER |
128 | bool "Enable freezer for suspend to RAM/standby" \ | |
129 | if ARCH_WANTS_FREEZER_CONTROL || BROKEN | |
130 | depends on SUSPEND | |
131 | default y | |
132 | help | |
133 | This allows you to turn off the freezer for suspend. If this is | |
134 | done, no tasks are frozen for suspend to RAM/standby. | |
135 | ||
136 | Turning OFF this setting is NOT recommended! If in doubt, say Y. | |
137 | ||
b0cb1a19 | 138 | config HIBERNATION |
296699de | 139 | bool "Hibernation (aka 'suspend to disk')" |
801e4062 | 140 | depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE |
f996fc96 BS |
141 | select LZO_COMPRESS |
142 | select LZO_DECOMPRESS | |
dd4c4f17 | 143 | select SUSPEND_NVS if HAS_IOMEM |
1da177e4 | 144 | ---help--- |
a7ee2e5f DB |
145 | Enable the suspend to disk (STD) functionality, which is usually |
146 | called "hibernation" in user interfaces. STD checkpoints the | |
147 | system and powers it off; and restores that checkpoint on reboot. | |
1da177e4 | 148 | |
23b168d4 PM |
149 | You can suspend your machine with 'echo disk > /sys/power/state' |
150 | after placing resume=/dev/swappartition on the kernel command line | |
151 | in your bootloader's configuration file. | |
152 | ||
c7276fde RW |
153 | Alternatively, you can use the additional userland tools available |
154 | from <http://suspend.sf.net>. | |
155 | ||
156 | In principle it does not require ACPI or APM, although for example | |
a7ee2e5f DB |
157 | ACPI will be used for the final steps when it is available. One |
158 | of the reasons to use software suspend is that the firmware hooks | |
159 | for suspend states like suspend-to-RAM (STR) often don't work very | |
160 | well with Linux. | |
c7276fde RW |
161 | |
162 | It creates an image which is saved in your active swap. Upon the next | |
1da177e4 LT |
163 | boot, pass the 'resume=/dev/swappartition' argument to the kernel to |
164 | have it detect the saved image, restore memory state from it, and | |
165 | continue to run as before. If you do not want the previous state to | |
c7276fde RW |
166 | be reloaded, then use the 'noresume' kernel command line argument. |
167 | Note, however, that fsck will be run on your filesystems and you will | |
168 | need to run mkswap against the swap partition used for the suspend. | |
1da177e4 | 169 | |
c7276fde RW |
170 | It also works with swap files to a limited extent (for details see |
171 | <file:Documentation/power/swsusp-and-swap-files.txt>). | |
1da177e4 | 172 | |
c7276fde RW |
173 | Right now you may boot without resuming and resume later but in the |
174 | meantime you cannot use the swap partition(s)/file(s) involved in | |
175 | suspending. Also in this case you must not use the filesystems | |
176 | that were mounted before the suspend. In particular, you MUST NOT | |
177 | MOUNT any journaled filesystems mounted before the suspend or they | |
178 | will get corrupted in a nasty way. | |
1da177e4 | 179 | |
c7276fde | 180 | For more information take a look at <file:Documentation/power/swsusp.txt>. |
471b40d0 | 181 | |
1da177e4 LT |
182 | config PM_STD_PARTITION |
183 | string "Default resume partition" | |
b0cb1a19 | 184 | depends on HIBERNATION |
1da177e4 LT |
185 | default "" |
186 | ---help--- | |
187 | The default resume partition is the partition that the suspend- | |
188 | to-disk implementation will look for a suspended disk image. | |
189 | ||
190 | The partition specified here will be different for almost every user. | |
191 | It should be a valid swap partition (at least for now) that is turned | |
192 | on before suspending. | |
193 | ||
194 | The partition specified can be overridden by specifying: | |
195 | ||
196 | resume=/dev/<other device> | |
197 | ||
198 | which will set the resume partition to the device specified. | |
199 | ||
200 | Note there is currently not a way to specify which device to save the | |
201 | suspended image to. It will simply pick the first available swap | |
202 | device. | |
203 | ||
7726942f RB |
204 | config APM_EMULATION |
205 | tristate "Advanced Power Management Emulation" | |
206 | depends on PM && SYS_SUPPORTS_APM_EMULATION | |
207 | help | |
208 | APM is a BIOS specification for saving power using several different | |
209 | techniques. This is mostly useful for battery powered laptops with | |
210 | APM compliant BIOSes. If you say Y here, the system time will be | |
211 | reset after a RESUME operation, the /proc/apm device will provide | |
212 | battery status information, and user-space programs will receive | |
213 | notification of APM "events" (e.g. battery status change). | |
214 | ||
215 | In order to use APM, you will need supporting software. For location | |
53471121 | 216 | and more information, read <file:Documentation/power/pm.txt> and the |
7726942f RB |
217 | Battery Powered Linux mini-HOWTO, available from |
218 | <http://www.tldp.org/docs.html#howto>. | |
219 | ||
220 | This driver does not spin down disk drives (see the hdparm(8) | |
221 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
222 | VESA-compliant "green" monitors. | |
223 | ||
224 | Generally, if you don't have a battery in your machine, there isn't | |
225 | much point in using this driver and you should say N. If you get | |
226 | random kernel OOPSes or reboots that don't seem to be related to | |
227 | anything, try disabling/enabling this option (or disabling/enabling | |
228 | APM in your BIOS). | |
5e928f77 RW |
229 | |
230 | config PM_RUNTIME | |
231 | bool "Run-time PM core functionality" | |
232 | depends on PM | |
233 | ---help--- | |
234 | Enable functionality allowing I/O devices to be put into energy-saving | |
235 | (low power) states at run time (or autosuspended) after a specified | |
236 | period of inactivity and woken up in response to a hardware-generated | |
237 | wake-up event or a driver's request. | |
238 | ||
239 | Hardware support is generally required for this functionality to work | |
240 | and the bus type drivers of the buses the devices are on are | |
241 | responsible for the actual handling of the autosuspend requests and | |
242 | wake-up events. | |
6cbf8214 RW |
243 | |
244 | config PM_OPS | |
245 | bool | |
246 | depends on PM_SLEEP || PM_RUNTIME | |
247 | default y |