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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 | ||
bca73e4b | 22 | config PM_LEGACY |
f89bce3d | 23 | bool "Legacy Power Management API (DEPRECATED)" |
bca73e4b | 24 | depends on PM |
f89bce3d | 25 | default n |
bca73e4b | 26 | ---help--- |
f89bce3d DB |
27 | Support for pm_register() and friends. This old API is obsoleted |
28 | by the driver model. | |
bca73e4b | 29 | |
f89bce3d | 30 | If unsure, say N. |
bca73e4b | 31 | |
1da177e4 LT |
32 | config PM_DEBUG |
33 | bool "Power Management Debug Support" | |
34 | depends on PM | |
35 | ---help--- | |
a0349828 BC |
36 | This option enables various debugging support in the Power Management |
37 | code. This is helpful when debugging and reporting PM bugs, like | |
38 | suspend support. | |
39 | ||
40 | config PM_VERBOSE | |
41 | bool "Verbose Power Management debugging" | |
42 | depends on PM_DEBUG | |
43 | default n | |
44 | ---help--- | |
45 | This option enables verbose messages from the Power Management code. | |
1da177e4 | 46 | |
90dda1cb JB |
47 | config CAN_PM_TRACE |
48 | def_bool y | |
49 | depends on PM_DEBUG && PM_SLEEP && EXPERIMENTAL | |
50 | ||
eb71c87a | 51 | config PM_TRACE |
90dda1cb JB |
52 | bool |
53 | help | |
54 | This enables code to save the last PM event point across | |
55 | reboot. The architecture needs to support this, x86 for | |
56 | example does by saving things in the RTC, see below. | |
57 | ||
58 | The architecture specific code must provide the extern | |
59 | functions from <linux/resume-trace.h> as well as the | |
60 | <asm/resume-trace.h> header with a TRACE_RESUME() macro. | |
61 | ||
62 | The way the information is presented is architecture- | |
63 | dependent, x86 will print the information during a | |
64 | late_initcall. | |
65 | ||
66 | config PM_TRACE_RTC | |
eb71c87a | 67 | bool "Suspend/resume event tracing" |
90dda1cb JB |
68 | depends on CAN_PM_TRACE |
69 | depends on X86 | |
70 | select PM_TRACE | |
5c31f273 | 71 | default n |
eb71c87a LT |
72 | ---help--- |
73 | This enables some cheesy code to save the last PM event point in the | |
74 | RTC across reboots, so that you can debug a machine that just hangs | |
75 | during suspend (or more commonly, during resume). | |
76 | ||
5c31f273 AM |
77 | To use this debugging feature you should attempt to suspend the machine, |
78 | then reboot it, then run | |
79 | ||
80 | dmesg -s 1000000 | grep 'hash matches' | |
81 | ||
82 | CAUTION: this option will cause your machine's real-time clock to be | |
83 | set to an invalid time after a resume. | |
84 | ||
f3de4be9 | 85 | config PM_SLEEP_SMP |
296699de | 86 | bool |
801e4062 | 87 | depends on SMP |
f4cb5700 | 88 | depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE |
f3de4be9 | 89 | depends on PM_SLEEP |
296699de RW |
90 | select HOTPLUG_CPU |
91 | default y | |
92 | ||
93 | config PM_SLEEP | |
94 | bool | |
95 | depends on SUSPEND || HIBERNATION | |
96 | default y | |
97 | ||
98 | config SUSPEND | |
99 | bool "Suspend to RAM and standby" | |
f4cb5700 | 100 | depends on PM && ARCH_SUSPEND_POSSIBLE |
296699de RW |
101 | default y |
102 | ---help--- | |
103 | Allow the system to enter sleep states in which main memory is | |
104 | powered and thus its contents are preserved, such as the | |
f4cb5700 | 105 | suspend-to-RAM state (e.g. the ACPI S3 state). |
296699de | 106 | |
b0cb1a19 | 107 | config HIBERNATION |
296699de | 108 | bool "Hibernation (aka 'suspend to disk')" |
801e4062 | 109 | depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE |
1da177e4 | 110 | ---help--- |
a7ee2e5f DB |
111 | Enable the suspend to disk (STD) functionality, which is usually |
112 | called "hibernation" in user interfaces. STD checkpoints the | |
113 | system and powers it off; and restores that checkpoint on reboot. | |
1da177e4 | 114 | |
c7276fde RW |
115 | You can suspend your machine with 'echo disk > /sys/power/state'. |
116 | Alternatively, you can use the additional userland tools available | |
117 | from <http://suspend.sf.net>. | |
118 | ||
119 | In principle it does not require ACPI or APM, although for example | |
a7ee2e5f DB |
120 | ACPI will be used for the final steps when it is available. One |
121 | of the reasons to use software suspend is that the firmware hooks | |
122 | for suspend states like suspend-to-RAM (STR) often don't work very | |
123 | well with Linux. | |
c7276fde RW |
124 | |
125 | It creates an image which is saved in your active swap. Upon the next | |
1da177e4 LT |
126 | boot, pass the 'resume=/dev/swappartition' argument to the kernel to |
127 | have it detect the saved image, restore memory state from it, and | |
128 | continue to run as before. If you do not want the previous state to | |
c7276fde RW |
129 | be reloaded, then use the 'noresume' kernel command line argument. |
130 | Note, however, that fsck will be run on your filesystems and you will | |
131 | need to run mkswap against the swap partition used for the suspend. | |
1da177e4 | 132 | |
c7276fde RW |
133 | It also works with swap files to a limited extent (for details see |
134 | <file:Documentation/power/swsusp-and-swap-files.txt>). | |
1da177e4 | 135 | |
c7276fde RW |
136 | Right now you may boot without resuming and resume later but in the |
137 | meantime you cannot use the swap partition(s)/file(s) involved in | |
138 | suspending. Also in this case you must not use the filesystems | |
139 | that were mounted before the suspend. In particular, you MUST NOT | |
140 | MOUNT any journaled filesystems mounted before the suspend or they | |
141 | will get corrupted in a nasty way. | |
1da177e4 | 142 | |
c7276fde | 143 | For more information take a look at <file:Documentation/power/swsusp.txt>. |
471b40d0 | 144 | |
1da177e4 LT |
145 | config PM_STD_PARTITION |
146 | string "Default resume partition" | |
b0cb1a19 | 147 | depends on HIBERNATION |
1da177e4 LT |
148 | default "" |
149 | ---help--- | |
150 | The default resume partition is the partition that the suspend- | |
151 | to-disk implementation will look for a suspended disk image. | |
152 | ||
153 | The partition specified here will be different for almost every user. | |
154 | It should be a valid swap partition (at least for now) that is turned | |
155 | on before suspending. | |
156 | ||
157 | The partition specified can be overridden by specifying: | |
158 | ||
159 | resume=/dev/<other device> | |
160 | ||
161 | which will set the resume partition to the device specified. | |
162 | ||
163 | Note there is currently not a way to specify which device to save the | |
164 | suspended image to. It will simply pick the first available swap | |
165 | device. | |
166 | ||
7726942f RB |
167 | config APM_EMULATION |
168 | tristate "Advanced Power Management Emulation" | |
169 | depends on PM && SYS_SUPPORTS_APM_EMULATION | |
170 | help | |
171 | APM is a BIOS specification for saving power using several different | |
172 | techniques. This is mostly useful for battery powered laptops with | |
173 | APM compliant BIOSes. If you say Y here, the system time will be | |
174 | reset after a RESUME operation, the /proc/apm device will provide | |
175 | battery status information, and user-space programs will receive | |
176 | notification of APM "events" (e.g. battery status change). | |
177 | ||
178 | In order to use APM, you will need supporting software. For location | |
179 | and more information, read <file:Documentation/pm.txt> and the | |
180 | Battery Powered Linux mini-HOWTO, available from | |
181 | <http://www.tldp.org/docs.html#howto>. | |
182 | ||
183 | This driver does not spin down disk drives (see the hdparm(8) | |
184 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
185 | VESA-compliant "green" monitors. | |
186 | ||
187 | Generally, if you don't have a battery in your machine, there isn't | |
188 | much point in using this driver and you should say N. If you get | |
189 | random kernel OOPSes or reboots that don't seem to be related to | |
190 | anything, try disabling/enabling this option (or disabling/enabling | |
191 | APM in your BIOS). |