1config SUSPEND 2 bool "Suspend to RAM and standby" 3 depends on ARCH_SUSPEND_POSSIBLE 4 default y 5 ---help--- 6 Allow the system to enter sleep states in which main memory is 7 powered and thus its contents are preserved, such as the 8 suspend-to-RAM state (e.g. the ACPI S3 state). 9 10config SUSPEND_FREEZER 11 bool "Enable freezer for suspend to RAM/standby" \ 12 if ARCH_WANTS_FREEZER_CONTROL || BROKEN 13 depends on SUSPEND 14 default y 15 help 16 This allows you to turn off the freezer for suspend. If this is 17 done, no tasks are frozen for suspend to RAM/standby. 18 19 Turning OFF this setting is NOT recommended! If in doubt, say Y. 20 21config HIBERNATE_CALLBACKS 22 bool 23 24config HIBERNATION 25 bool "Hibernation (aka 'suspend to disk')" 26 depends on SWAP && ARCH_HIBERNATION_POSSIBLE 27 select HIBERNATE_CALLBACKS 28 select LZO_COMPRESS 29 select LZO_DECOMPRESS 30 select CRC32 31 ---help--- 32 Enable the suspend to disk (STD) functionality, which is usually 33 called "hibernation" in user interfaces. STD checkpoints the 34 system and powers it off; and restores that checkpoint on reboot. 35 36 You can suspend your machine with 'echo disk > /sys/power/state' 37 after placing resume=/dev/swappartition on the kernel command line 38 in your bootloader's configuration file. 39 40 Alternatively, you can use the additional userland tools available 41 from <http://suspend.sf.net>. 42 43 In principle it does not require ACPI or APM, although for example 44 ACPI will be used for the final steps when it is available. One 45 of the reasons to use software suspend is that the firmware hooks 46 for suspend states like suspend-to-RAM (STR) often don't work very 47 well with Linux. 48 49 It creates an image which is saved in your active swap. Upon the next 50 boot, pass the 'resume=/dev/swappartition' argument to the kernel to 51 have it detect the saved image, restore memory state from it, and 52 continue to run as before. If you do not want the previous state to 53 be reloaded, then use the 'noresume' kernel command line argument. 54 Note, however, that fsck will be run on your filesystems and you will 55 need to run mkswap against the swap partition used for the suspend. 56 57 It also works with swap files to a limited extent (for details see 58 <file:Documentation/power/swsusp-and-swap-files.txt>). 59 60 Right now you may boot without resuming and resume later but in the 61 meantime you cannot use the swap partition(s)/file(s) involved in 62 suspending. Also in this case you must not use the filesystems 63 that were mounted before the suspend. In particular, you MUST NOT 64 MOUNT any journaled filesystems mounted before the suspend or they 65 will get corrupted in a nasty way. 66 67 For more information take a look at <file:Documentation/power/swsusp.txt>. 68 69config ARCH_SAVE_PAGE_KEYS 70 bool 71 72config PM_STD_PARTITION 73 string "Default resume partition" 74 depends on HIBERNATION 75 default "" 76 ---help--- 77 The default resume partition is the partition that the suspend- 78 to-disk implementation will look for a suspended disk image. 79 80 The partition specified here will be different for almost every user. 81 It should be a valid swap partition (at least for now) that is turned 82 on before suspending. 83 84 The partition specified can be overridden by specifying: 85 86 resume=/dev/<other device> 87 88 which will set the resume partition to the device specified. 89 90 Note there is currently not a way to specify which device to save the 91 suspended image to. It will simply pick the first available swap 92 device. 93 94config PM_SLEEP 95 def_bool y 96 depends on SUSPEND || HIBERNATE_CALLBACKS 97 select PM 98 99config PM_SLEEP_SMP 100 def_bool y 101 depends on SMP 102 depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE 103 depends on PM_SLEEP 104 select HOTPLUG_CPU 105 106config PM_AUTOSLEEP 107 bool "Opportunistic sleep" 108 depends on PM_SLEEP 109 default n 110 ---help--- 111 Allow the kernel to trigger a system transition into a global sleep 112 state automatically whenever there are no active wakeup sources. 113 114config PM_WAKELOCKS 115 bool "User space wakeup sources interface" 116 depends on PM_SLEEP 117 default n 118 ---help--- 119 Allow user space to create, activate and deactivate wakeup source 120 objects with the help of a sysfs-based interface. 121 122config PM_WAKELOCKS_LIMIT 123 int "Maximum number of user space wakeup sources (0 = no limit)" 124 range 0 100000 125 default 100 126 depends on PM_WAKELOCKS 127 128config PM_WAKELOCKS_GC 129 bool "Garbage collector for user space wakeup sources" 130 depends on PM_WAKELOCKS 131 default y 132 133config PM 134 bool "Device power management core functionality" 135 ---help--- 136 Enable functionality allowing I/O devices to be put into energy-saving 137 (low power) states, for example after a specified period of inactivity 138 (autosuspended), and woken up in response to a hardware-generated 139 wake-up event or a driver's request. 140 141 Hardware support is generally required for this functionality to work 142 and the bus type drivers of the buses the devices are on are 143 responsible for the actual handling of device suspend requests and 144 wake-up events. 145 146config PM_DEBUG 147 bool "Power Management Debug Support" 148 depends on PM 149 ---help--- 150 This option enables various debugging support in the Power Management 151 code. This is helpful when debugging and reporting PM bugs, like 152 suspend support. 153 154config PM_ADVANCED_DEBUG 155 bool "Extra PM attributes in sysfs for low-level debugging/testing" 156 depends on PM_DEBUG 157 ---help--- 158 Add extra sysfs attributes allowing one to access some Power Management 159 fields of device objects from user space. If you are not a kernel 160 developer interested in debugging/testing Power Management, say "no". 161 162config PM_TEST_SUSPEND 163 bool "Test suspend/resume and wakealarm during bootup" 164 depends on SUSPEND && PM_DEBUG && RTC_CLASS=y 165 ---help--- 166 This option will let you suspend your machine during bootup, and 167 make it wake up a few seconds later using an RTC wakeup alarm. 168 Enable this with a kernel parameter like "test_suspend=mem". 169 170 You probably want to have your system's RTC driver statically 171 linked, ensuring that it's available when this test runs. 172 173config PM_SLEEP_DEBUG 174 def_bool y 175 depends on PM_DEBUG && PM_SLEEP 176 177config DPM_WATCHDOG 178 bool "Device suspend/resume watchdog" 179 depends on PM_DEBUG && PSTORE 180 ---help--- 181 Sets up a watchdog timer to capture drivers that are 182 locked up attempting to suspend/resume a device. 183 A detected lockup causes system panic with message 184 captured in pstore device for inspection in subsequent 185 boot session. 186 187config DPM_WATCHDOG_TIMEOUT 188 int "Watchdog timeout in seconds" 189 range 1 120 190 default 12 191 depends on DPM_WATCHDOG 192 193config PM_TRACE 194 bool 195 help 196 This enables code to save the last PM event point across 197 reboot. The architecture needs to support this, x86 for 198 example does by saving things in the RTC, see below. 199 200 The architecture specific code must provide the extern 201 functions from <linux/resume-trace.h> as well as the 202 <asm/resume-trace.h> header with a TRACE_RESUME() macro. 203 204 The way the information is presented is architecture- 205 dependent, x86 will print the information during a 206 late_initcall. 207 208config PM_TRACE_RTC 209 bool "Suspend/resume event tracing" 210 depends on PM_SLEEP_DEBUG 211 depends on X86 212 select PM_TRACE 213 ---help--- 214 This enables some cheesy code to save the last PM event point in the 215 RTC across reboots, so that you can debug a machine that just hangs 216 during suspend (or more commonly, during resume). 217 218 To use this debugging feature you should attempt to suspend the 219 machine, reboot it and then run 220 221 dmesg -s 1000000 | grep 'hash matches' 222 223 CAUTION: this option will cause your machine's real-time clock to be 224 set to an invalid time after a resume. 225 226config APM_EMULATION 227 tristate "Advanced Power Management Emulation" 228 depends on PM && SYS_SUPPORTS_APM_EMULATION 229 help 230 APM is a BIOS specification for saving power using several different 231 techniques. This is mostly useful for battery powered laptops with 232 APM compliant BIOSes. If you say Y here, the system time will be 233 reset after a RESUME operation, the /proc/apm device will provide 234 battery status information, and user-space programs will receive 235 notification of APM "events" (e.g. battery status change). 236 237 In order to use APM, you will need supporting software. For location 238 and more information, read <file:Documentation/power/apm-acpi.txt> 239 and the Battery Powered Linux mini-HOWTO, available from 240 <http://www.tldp.org/docs.html#howto>. 241 242 This driver does not spin down disk drives (see the hdparm(8) 243 manpage ("man 8 hdparm") for that), and it doesn't turn off 244 VESA-compliant "green" monitors. 245 246 Generally, if you don't have a battery in your machine, there isn't 247 much point in using this driver and you should say N. If you get 248 random kernel OOPSes or reboots that don't seem to be related to 249 anything, try disabling/enabling this option (or disabling/enabling 250 APM in your BIOS). 251 252config PM_OPP 253 bool 254 ---help--- 255 SOCs have a standard set of tuples consisting of frequency and 256 voltage pairs that the device will support per voltage domain. This 257 is called Operating Performance Point or OPP. The actual definitions 258 of OPP varies over silicon within the same family of devices. 259 260 OPP layer organizes the data internally using device pointers 261 representing individual voltage domains and provides SOC 262 implementations a ready to use framework to manage OPPs. 263 For more information, read <file:Documentation/power/opp.txt> 264 265config PM_CLK 266 def_bool y 267 depends on PM && HAVE_CLK 268 269config PM_GENERIC_DOMAINS 270 bool 271 depends on PM 272 273config WQ_POWER_EFFICIENT_DEFAULT 274 bool "Enable workqueue power-efficient mode by default" 275 depends on PM 276 default n 277 help 278 Per-cpu workqueues are generally preferred because they show 279 better performance thanks to cache locality; unfortunately, 280 per-cpu workqueues tend to be more power hungry than unbound 281 workqueues. 282 283 Enabling workqueue.power_efficient kernel parameter makes the 284 per-cpu workqueues which were observed to contribute 285 significantly to power consumption unbound, leading to measurably 286 lower power usage at the cost of small performance overhead. 287 288 This config option determines whether workqueue.power_efficient 289 is enabled by default. 290 291 If in doubt, say N. 292 293config PM_GENERIC_DOMAINS_SLEEP 294 def_bool y 295 depends on PM_SLEEP && PM_GENERIC_DOMAINS 296 297config PM_GENERIC_DOMAINS_OF 298 def_bool y 299 depends on PM_GENERIC_DOMAINS && OF 300 301config CPU_PM 302 bool 303