config SUSPEND bool "Suspend to RAM and standby" depends on ARCH_SUSPEND_POSSIBLE default y ---help--- Allow the system to enter sleep states in which main memory is powered and thus its contents are preserved, such as the suspend-to-RAM state (e.g. the ACPI S3 state). config SUSPEND_FREEZER bool "Enable freezer for suspend to RAM/standby" \ if ARCH_WANTS_FREEZER_CONTROL || BROKEN depends on SUSPEND default y help This allows you to turn off the freezer for suspend. If this is done, no tasks are frozen for suspend to RAM/standby. Turning OFF this setting is NOT recommended! If in doubt, say Y. config SUSPEND_SKIP_SYNC bool "Skip kernel's sys_sync() on suspend to RAM/standby" depends on SUSPEND depends on EXPERT help Skip the kernel sys_sync() before freezing user processes. Some systems prefer not to pay this cost on every invocation of suspend, or they are content with invoking sync() from user-space before invoking suspend. Say Y if that's your case. config HIBERNATE_CALLBACKS bool config HIBERNATION bool "Hibernation (aka 'suspend to disk')" depends on SWAP && ARCH_HIBERNATION_POSSIBLE select HIBERNATE_CALLBACKS select LZO_COMPRESS select LZO_DECOMPRESS select CRC32 ---help--- Enable the suspend to disk (STD) functionality, which is usually called "hibernation" in user interfaces. STD checkpoints the system and powers it off; and restores that checkpoint on reboot. You can suspend your machine with 'echo disk > /sys/power/state' after placing resume=/dev/swappartition on the kernel command line in your bootloader's configuration file. Alternatively, you can use the additional userland tools available from . In principle it does not require ACPI or APM, although for example ACPI will be used for the final steps when it is available. One of the reasons to use software suspend is that the firmware hooks for suspend states like suspend-to-RAM (STR) often don't work very well with Linux. It creates an image which is saved in your active swap. Upon the next boot, pass the 'resume=/dev/swappartition' argument to the kernel to have it detect the saved image, restore memory state from it, and continue to run as before. If you do not want the previous state to be reloaded, then use the 'noresume' kernel command line argument. Note, however, that fsck will be run on your filesystems and you will need to run mkswap against the swap partition used for the suspend. It also works with swap files to a limited extent (for details see ). Right now you may boot without resuming and resume later but in the meantime you cannot use the swap partition(s)/file(s) involved in suspending. Also in this case you must not use the filesystems that were mounted before the suspend. In particular, you MUST NOT MOUNT any journaled filesystems mounted before the suspend or they will get corrupted in a nasty way. For more information take a look at . config ARCH_SAVE_PAGE_KEYS bool config PM_STD_PARTITION string "Default resume partition" depends on HIBERNATION default "" ---help--- The default resume partition is the partition that the suspend- to-disk implementation will look for a suspended disk image. The partition specified here will be different for almost every user. It should be a valid swap partition (at least for now) that is turned on before suspending. The partition specified can be overridden by specifying: resume=/dev/ which will set the resume partition to the device specified. Note there is currently not a way to specify which device to save the suspended image to. It will simply pick the first available swap device. menuconfig TOI_CORE bool "Enhanced Hibernation (TuxOnIce)" depends on HIBERNATION default y ---help--- TuxOnIce is the 'new and improved' suspend support. See the TuxOnIce home page (tuxonice.net) for FAQs, HOWTOs and other documentation. comment "Image Storage (you need at least one allocator)" depends on TOI_CORE config TOI_FILE bool "File Allocator" depends on TOI_CORE default y ---help--- This option enables support for storing an image in a simple file. You might want this if your swap is sometimes full enough that you don't have enough spare space to store an image. config TOI_SWAP bool "Swap Allocator" depends on TOI_CORE && SWAP default y ---help--- This option enables support for storing an image in your swap space. comment "General Options" depends on TOI_CORE config TOI_PRUNE bool "Image pruning support" depends on TOI_CORE && CRYPTO && BROKEN default y ---help--- This option adds support for using cryptoapi hashing algorithms to identify pages with the same content. We then write a much smaller pointer to the first copy of the data instead of a complete (perhaps compressed) additional copy. You probably want this, so say Y here. comment "No image pruning support available without Cryptoapi support." depends on TOI_CORE && !CRYPTO config TOI_CRYPTO bool "Compression support" depends on TOI_CORE && CRYPTO default y ---help--- This option adds support for using cryptoapi compression algorithms. Compression is particularly useful as it can more than double your suspend and resume speed (depending upon how well your image compresses). You probably want this, so say Y here. comment "No compression support available without Cryptoapi support." depends on TOI_CORE && !CRYPTO config TOI_USERUI bool "Userspace User Interface support" depends on TOI_CORE && NET && (VT || SERIAL_CONSOLE) default y ---help--- This option enabled support for a userspace based user interface to TuxOnIce, which allows you to have a nice display while suspending and resuming, and also enables features such as pressing escape to cancel a cycle or interactive debugging. config TOI_USERUI_DEFAULT_PATH string "Default userui program location" default "/usr/local/sbin/tuxoniceui_text" depends on TOI_USERUI ---help--- This entry allows you to specify a default path to the userui binary. config TOI_DEFAULT_IMAGE_SIZE_LIMIT int "Default image size limit" range -2 65536 default "-2" depends on TOI_CORE ---help--- This entry allows you to specify a default image size limit. It can be overridden at run-time using /sys/power/tuxonice/image_size_limit. config TOI_KEEP_IMAGE bool "Allow Keep Image Mode" depends on TOI_CORE ---help--- This option allows you to keep and image and reuse it. It is intended __ONLY__ for use with systems where all filesystems are mounted read- only (kiosks, for example). To use it, compile this option in and boot normally. Set the KEEP_IMAGE flag in /sys/power/tuxonice and suspend. When you resume, the image will not be removed. You will be unable to turn off swap partitions (assuming you are using the swap allocator), but future suspends simply do a power-down. The image can be updated using the kernel command line parameter suspend_act= to turn off the keep image bit. Keep image mode is a little less user friendly on purpose - it should not be used without thought! config TOI_INCREMENTAL bool "Incremental Image Support" depends on TOI_CORE && 64BIT && TOI_KEEP_IMAGE default n ---help--- This option enables the work in progress toward using the dirty page tracking to record changes to pages. It is hoped that this will be an initial step toward implementing storing just the differences between consecutive images, which will increase the amount of storage needed for the image, but also increase the speed at which writing an image occurs and reduce the wear and tear on drives. At the moment, all that is implemented is the first step of keeping an existing image and then comparing it to the contents in memory (by setting /sys/power/tuxonice/verify_image to 1 and triggering a (fake) resume) to see what the page change tracking should find to be different. If you have verify_image set to 1, TuxOnIce will automatically invalidate the old image when you next try to hibernate, so there's no greater chance of disk corruption than normal. comment "No incremental image support available without Keep Image support." depends on TOI_CORE && !TOI_KEEP_IMAGE && 64BIT config TOI_REPLACE_SWSUSP bool "Replace swsusp by default" default y depends on TOI_CORE ---help--- TuxOnIce can replace swsusp. This option makes that the default state, requiring you to echo 0 > /sys/power/tuxonice/replace_swsusp if you want to use the vanilla kernel functionality. Note that your initrd/ramfs will need to do this before trying to resume, too. With overriding swsusp enabled, echoing disk to /sys/power/state will start a TuxOnIce cycle. If resume= doesn't specify an allocator and both the swap and file allocators are compiled in, the swap allocator will be used by default. config TOI_IGNORE_LATE_INITCALL bool "Wait for initrd/ramfs to run, by default" default n depends on TOI_CORE ---help--- When booting, TuxOnIce can check for an image and start to resume prior to any initrd/ramfs running (via a late initcall). If you don't have an initrd/ramfs, this is what you want to happen - otherwise you won't be able to safely resume. You should set this option to 'No'. If, however, you want your initrd/ramfs to run anyway before resuming, you need to tell TuxOnIce to ignore that earlier opportunity to resume. This can be done either by using this compile time option, or by overriding this option with the boot-time parameter toi_initramfs_resume_only=1. Note that if TuxOnIce can't resume at the earlier opportunity, the value of this option won't matter - the initramfs/initrd (if any) will run anyway. menuconfig TOI_CLUSTER bool "Cluster support" default n depends on TOI_CORE && NET && BROKEN ---help--- Support for linking multiple machines in a cluster so that they suspend and resume together. config TOI_DEFAULT_CLUSTER_INTERFACE string "Default cluster interface" depends on TOI_CLUSTER ---help--- The default interface on which to communicate with other nodes in the cluster. If no value is set here, cluster support will be disabled by default. config TOI_DEFAULT_CLUSTER_KEY string "Default cluster key" default "Default" depends on TOI_CLUSTER ---help--- The default key used by this node. All nodes in the same cluster have the same key. Multiple clusters may coexist on the same lan by using different values for this key. config TOI_CLUSTER_IMAGE_TIMEOUT int "Timeout when checking for image" default 15 depends on TOI_CLUSTER ---help--- Timeout (seconds) before continuing to boot when waiting to see whether other nodes might have an image. Set to -1 to wait indefinitely. In WAIT_UNTIL_NODES is non zero, we might continue booting sooner than this timeout. config TOI_CLUSTER_WAIT_UNTIL_NODES int "Nodes without image before continuing" default 0 depends on TOI_CLUSTER ---help--- When booting and no image is found, we wait to see if other nodes have an image before continuing to boot. This value lets us continue after seeing a certain number of nodes without an image, instead of continuing to wait for the timeout. Set to 0 to only use the timeout. config TOI_DEFAULT_CLUSTER_PRE_HIBERNATE string "Default pre-hibernate script" depends on TOI_CLUSTER ---help--- The default script to be called when starting to hibernate. config TOI_DEFAULT_CLUSTER_POST_HIBERNATE string "Default post-hibernate script" depends on TOI_CLUSTER ---help--- The default script to be called after resuming from hibernation. config TOI_DEFAULT_WAIT int "Default waiting time for emergency boot messages" default "25" range -1 32768 depends on TOI_CORE help TuxOnIce can display warnings very early in the process of resuming, if (for example) it appears that you have booted a kernel that doesn't match an image on disk. It can then give you the opportunity to either continue booting that kernel, or reboot the machine. This option can be used to control how long to wait in such circumstances. -1 means wait forever. 0 means don't wait at all (do the default action, which will generally be to continue booting and remove the image). Values of 1 or more indicate a number of seconds (up to 255) to wait before doing the default. config TOI_DEFAULT_EXTRA_PAGES_ALLOWANCE int "Default extra pages allowance" default "2000" range 500 32768 depends on TOI_CORE help This value controls the default for the allowance TuxOnIce makes for drivers to allocate extra memory during the atomic copy. The default value of 2000 will be okay in most cases. If you are using DRI, the easiest way to find what value to use is to try to hibernate and look at how many pages were actually needed in the sysfs entry /sys/power/tuxonice/debug_info (first number on the last line), adding a little extra because the value is not always the same. config TOI_CHECKSUM bool "Checksum pageset2" default n depends on TOI_CORE select CRYPTO select CRYPTO_ALGAPI select CRYPTO_MD4 ---help--- Adds support for checksumming pageset2 pages, to ensure you really get an atomic copy. Since some filesystems (XFS especially) change metadata even when there's no other activity, we need this to check for pages that have been changed while we were saving the page cache. If your debugging output always says no pages were resaved, you may be able to safely disable this option. config TOI bool depends on TOI_CORE!=n default y config TOI_ZRAM_SUPPORT def_bool y depends on TOI && ZRAM!=n config PM_SLEEP def_bool y depends on SUSPEND || HIBERNATE_CALLBACKS select PM config PM_SLEEP_SMP def_bool y depends on SMP depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE depends on PM_SLEEP select HOTPLUG_CPU config PM_AUTOSLEEP bool "Opportunistic sleep" depends on PM_SLEEP default n ---help--- Allow the kernel to trigger a system transition into a global sleep state automatically whenever there are no active wakeup sources. config PM_WAKELOCKS bool "User space wakeup sources interface" depends on PM_SLEEP default n ---help--- Allow user space to create, activate and deactivate wakeup source objects with the help of a sysfs-based interface. config PM_WAKELOCKS_LIMIT int "Maximum number of user space wakeup sources (0 = no limit)" range 0 100000 default 100 depends on PM_WAKELOCKS config PM_WAKELOCKS_GC bool "Garbage collector for user space wakeup sources" depends on PM_WAKELOCKS default y config PM bool "Device power management core functionality" ---help--- Enable functionality allowing I/O devices to be put into energy-saving (low power) states, for example after a specified period of inactivity (autosuspended), and woken up in response to a hardware-generated wake-up event or a driver's request. Hardware support is generally required for this functionality to work and the bus type drivers of the buses the devices are on are responsible for the actual handling of device suspend requests and wake-up events. config PM_DEBUG bool "Power Management Debug Support" depends on PM ---help--- This option enables various debugging support in the Power Management code. This is helpful when debugging and reporting PM bugs, like suspend support. config PM_ADVANCED_DEBUG bool "Extra PM attributes in sysfs for low-level debugging/testing" depends on PM_DEBUG ---help--- Add extra sysfs attributes allowing one to access some Power Management fields of device objects from user space. If you are not a kernel developer interested in debugging/testing Power Management, say "no". config PM_TEST_SUSPEND bool "Test suspend/resume and wakealarm during bootup" depends on SUSPEND && PM_DEBUG && RTC_CLASS=y ---help--- This option will let you suspend your machine during bootup, and make it wake up a few seconds later using an RTC wakeup alarm. Enable this with a kernel parameter like "test_suspend=mem". You probably want to have your system's RTC driver statically linked, ensuring that it's available when this test runs. config PM_SLEEP_DEBUG def_bool y depends on PM_DEBUG && PM_SLEEP config DPM_WATCHDOG bool "Device suspend/resume watchdog" depends on PM_DEBUG && PSTORE ---help--- Sets up a watchdog timer to capture drivers that are locked up attempting to suspend/resume a device. A detected lockup causes system panic with message captured in pstore device for inspection in subsequent boot session. config DPM_WATCHDOG_TIMEOUT int "Watchdog timeout in seconds" range 1 120 default 60 depends on DPM_WATCHDOG config PM_TRACE bool help This enables code to save the last PM event point across reboot. The architecture needs to support this, x86 for example does by saving things in the RTC, see below. The architecture specific code must provide the extern functions from as well as the header with a TRACE_RESUME() macro. The way the information is presented is architecture- dependent, x86 will print the information during a late_initcall. config PM_TRACE_RTC bool "Suspend/resume event tracing" depends on PM_SLEEP_DEBUG depends on X86 select PM_TRACE ---help--- This enables some cheesy code to save the last PM event point in the RTC across reboots, so that you can debug a machine that just hangs during suspend (or more commonly, during resume). To use this debugging feature you should attempt to suspend the machine, reboot it and then run dmesg -s 1000000 | grep 'hash matches' CAUTION: this option will cause your machine's real-time clock to be set to an invalid time after a resume. config APM_EMULATION tristate "Advanced Power Management Emulation" depends on SYS_SUPPORTS_APM_EMULATION help APM is a BIOS specification for saving power using several different techniques. This is mostly useful for battery powered laptops with APM compliant BIOSes. If you say Y here, the system time will be reset after a RESUME operation, the /proc/apm device will provide battery status information, and user-space programs will receive notification of APM "events" (e.g. battery status change). In order to use APM, you will need supporting software. For location and more information, read and the Battery Powered Linux mini-HOWTO, available from . This driver does not spin down disk drives (see the hdparm(8) manpage ("man 8 hdparm") for that), and it doesn't turn off VESA-compliant "green" monitors. Generally, if you don't have a battery in your machine, there isn't much point in using this driver and you should say N. If you get random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS). config PM_OPP bool select SRCU ---help--- SOCs have a standard set of tuples consisting of frequency and voltage pairs that the device will support per voltage domain. This is called Operating Performance Point or OPP. The actual definitions of OPP varies over silicon within the same family of devices. OPP layer organizes the data internally using device pointers representing individual voltage domains and provides SOC implementations a ready to use framework to manage OPPs. For more information, read config PM_CLK def_bool y depends on PM && HAVE_CLK config PM_GENERIC_DOMAINS bool depends on PM config WQ_POWER_EFFICIENT_DEFAULT bool "Enable workqueue power-efficient mode by default" depends on PM default n help Per-cpu workqueues are generally preferred because they show better performance thanks to cache locality; unfortunately, per-cpu workqueues tend to be more power hungry than unbound workqueues. Enabling workqueue.power_efficient kernel parameter makes the per-cpu workqueues which were observed to contribute significantly to power consumption unbound, leading to measurably lower power usage at the cost of small performance overhead. This config option determines whether workqueue.power_efficient is enabled by default. If in doubt, say N. config PM_GENERIC_DOMAINS_SLEEP def_bool y depends on PM_SLEEP && PM_GENERIC_DOMAINS config PM_GENERIC_DOMAINS_OF def_bool y depends on PM_GENERIC_DOMAINS && OF config CPU_PM bool