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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 | |
eb71c87a LT |
47 | config PM_TRACE |
48 | bool "Suspend/resume event tracing" | |
296699de | 49 | depends on PM_DEBUG && X86 && PM_SLEEP && EXPERIMENTAL |
5c31f273 | 50 | default n |
eb71c87a LT |
51 | ---help--- |
52 | This enables some cheesy code to save the last PM event point in the | |
53 | RTC across reboots, so that you can debug a machine that just hangs | |
54 | during suspend (or more commonly, during resume). | |
55 | ||
5c31f273 AM |
56 | To use this debugging feature you should attempt to suspend the machine, |
57 | then reboot it, then run | |
58 | ||
59 | dmesg -s 1000000 | grep 'hash matches' | |
60 | ||
61 | CAUTION: this option will cause your machine's real-time clock to be | |
62 | set to an invalid time after a resume. | |
63 | ||
f3de4be9 | 64 | config PM_SLEEP_SMP |
296699de | 65 | bool |
f3de4be9 RW |
66 | depends on SUSPEND_SMP_POSSIBLE || HIBERNATION_SMP_POSSIBLE |
67 | depends on PM_SLEEP | |
296699de RW |
68 | select HOTPLUG_CPU |
69 | default y | |
70 | ||
71 | config PM_SLEEP | |
72 | bool | |
73 | depends on SUSPEND || HIBERNATION | |
74 | default y | |
75 | ||
f3de4be9 RW |
76 | config SUSPEND_UP_POSSIBLE |
77 | bool | |
78 | depends on (X86 && !X86_VOYAGER) || PPC || ARM || BLACKFIN || MIPS \ | |
79 | || SUPERH || FRV | |
80 | depends on !SMP | |
81 | default y | |
82 | ||
83 | config SUSPEND_SMP_POSSIBLE | |
84 | bool | |
85 | depends on (X86 && !X86_VOYAGER) \ | |
86 | || (PPC && (PPC_PSERIES || PPC_PMAC)) || ARM | |
87 | depends on SMP | |
88 | default y | |
89 | ||
296699de RW |
90 | config SUSPEND |
91 | bool "Suspend to RAM and standby" | |
92 | depends on PM | |
f3de4be9 | 93 | depends on SUSPEND_UP_POSSIBLE || SUSPEND_SMP_POSSIBLE |
296699de RW |
94 | default y |
95 | ---help--- | |
96 | Allow the system to enter sleep states in which main memory is | |
97 | powered and thus its contents are preserved, such as the | |
98 | suspend-to-RAM state (i.e. the ACPI S3 state). | |
99 | ||
f3de4be9 RW |
100 | config HIBERNATION_UP_POSSIBLE |
101 | bool | |
459685c7 | 102 | depends on X86 || PPC64_SWSUSP || PPC32 |
f3de4be9 RW |
103 | depends on !SMP |
104 | default y | |
105 | ||
106 | config HIBERNATION_SMP_POSSIBLE | |
107 | bool | |
108 | depends on (X86 && !X86_VOYAGER) || PPC64_SWSUSP | |
109 | depends on SMP | |
110 | default y | |
111 | ||
b0cb1a19 | 112 | config HIBERNATION |
296699de RW |
113 | bool "Hibernation (aka 'suspend to disk')" |
114 | depends on PM && SWAP | |
f3de4be9 | 115 | depends on HIBERNATION_UP_POSSIBLE || HIBERNATION_SMP_POSSIBLE |
1da177e4 | 116 | ---help--- |
a7ee2e5f DB |
117 | Enable the suspend to disk (STD) functionality, which is usually |
118 | called "hibernation" in user interfaces. STD checkpoints the | |
119 | system and powers it off; and restores that checkpoint on reboot. | |
1da177e4 | 120 | |
c7276fde RW |
121 | You can suspend your machine with 'echo disk > /sys/power/state'. |
122 | Alternatively, you can use the additional userland tools available | |
123 | from <http://suspend.sf.net>. | |
124 | ||
125 | In principle it does not require ACPI or APM, although for example | |
a7ee2e5f DB |
126 | ACPI will be used for the final steps when it is available. One |
127 | of the reasons to use software suspend is that the firmware hooks | |
128 | for suspend states like suspend-to-RAM (STR) often don't work very | |
129 | well with Linux. | |
c7276fde RW |
130 | |
131 | It creates an image which is saved in your active swap. Upon the next | |
1da177e4 LT |
132 | boot, pass the 'resume=/dev/swappartition' argument to the kernel to |
133 | have it detect the saved image, restore memory state from it, and | |
134 | continue to run as before. If you do not want the previous state to | |
c7276fde RW |
135 | be reloaded, then use the 'noresume' kernel command line argument. |
136 | Note, however, that fsck will be run on your filesystems and you will | |
137 | need to run mkswap against the swap partition used for the suspend. | |
1da177e4 | 138 | |
c7276fde RW |
139 | It also works with swap files to a limited extent (for details see |
140 | <file:Documentation/power/swsusp-and-swap-files.txt>). | |
1da177e4 | 141 | |
c7276fde RW |
142 | Right now you may boot without resuming and resume later but in the |
143 | meantime you cannot use the swap partition(s)/file(s) involved in | |
144 | suspending. Also in this case you must not use the filesystems | |
145 | that were mounted before the suspend. In particular, you MUST NOT | |
146 | MOUNT any journaled filesystems mounted before the suspend or they | |
147 | will get corrupted in a nasty way. | |
1da177e4 | 148 | |
c7276fde | 149 | For more information take a look at <file:Documentation/power/swsusp.txt>. |
471b40d0 | 150 | |
1da177e4 LT |
151 | config PM_STD_PARTITION |
152 | string "Default resume partition" | |
b0cb1a19 | 153 | depends on HIBERNATION |
1da177e4 LT |
154 | default "" |
155 | ---help--- | |
156 | The default resume partition is the partition that the suspend- | |
157 | to-disk implementation will look for a suspended disk image. | |
158 | ||
159 | The partition specified here will be different for almost every user. | |
160 | It should be a valid swap partition (at least for now) that is turned | |
161 | on before suspending. | |
162 | ||
163 | The partition specified can be overridden by specifying: | |
164 | ||
165 | resume=/dev/<other device> | |
166 | ||
167 | which will set the resume partition to the device specified. | |
168 | ||
169 | Note there is currently not a way to specify which device to save the | |
170 | suspended image to. It will simply pick the first available swap | |
171 | device. | |
172 | ||
7726942f RB |
173 | config APM_EMULATION |
174 | tristate "Advanced Power Management Emulation" | |
175 | depends on PM && SYS_SUPPORTS_APM_EMULATION | |
176 | help | |
177 | APM is a BIOS specification for saving power using several different | |
178 | techniques. This is mostly useful for battery powered laptops with | |
179 | APM compliant BIOSes. If you say Y here, the system time will be | |
180 | reset after a RESUME operation, the /proc/apm device will provide | |
181 | battery status information, and user-space programs will receive | |
182 | notification of APM "events" (e.g. battery status change). | |
183 | ||
184 | In order to use APM, you will need supporting software. For location | |
185 | and more information, read <file:Documentation/pm.txt> and the | |
186 | Battery Powered Linux mini-HOWTO, available from | |
187 | <http://www.tldp.org/docs.html#howto>. | |
188 | ||
189 | This driver does not spin down disk drives (see the hdparm(8) | |
190 | manpage ("man 8 hdparm") for that), and it doesn't turn off | |
191 | VESA-compliant "green" monitors. | |
192 | ||
193 | Generally, if you don't have a battery in your machine, there isn't | |
194 | much point in using this driver and you should say N. If you get | |
195 | random kernel OOPSes or reboots that don't seem to be related to | |
196 | anything, try disabling/enabling this option (or disabling/enabling | |
197 | APM in your BIOS). |