-config PM
- bool "Power Management support"
- depends on !IA64_HP_SIM
+config SUSPEND
+ bool "Suspend to RAM and standby"
+ depends on ARCH_SUSPEND_POSSIBLE
+ default y
---help---
- "Power Management" means that parts of your computer are shut
- off or put into a power conserving "sleep" mode if they are not
- being used. There are two competing standards for doing this: APM
- and ACPI. If you want to use either one, say Y here and then also
- to the requisite support below.
-
- Power Management is most important for battery powered laptop
- computers; if you have a laptop, check out the Linux Laptop home
- page on the WWW at <http://www.linux-on-laptops.com/> or
- Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
- and the Battery Powered Linux mini-HOWTO, available from
- <http://www.tldp.org/docs.html#howto>.
+ 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.
- Note that, even if you say N here, Linux on the x86 architecture
- will issue the hlt instruction if nothing is to be done, thereby
- sending the processor to sleep and saving power.
+ Turning OFF this setting is NOT recommended! If in doubt, say Y.
-config PM_LEGACY
- bool "Legacy Power Management API"
- depends on PM
- default y
+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---
- Support for pm_register() and friends.
+ 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.
- If unsure, say Y.
+ 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.
-config PM_DEBUG
- bool "Power Management Debug Support"
- depends on PM
- ---help---
- This option enables verbose debugging support in the Power Management
- code. This is helpful when debugging and reporting various PM bugs,
- like suspend support.
+ Alternatively, you can use the additional userland tools available
+ from <http://suspend.sf.net>.
-config SOFTWARE_SUSPEND
- bool "Software Suspend"
- depends on PM && SWAP && (X86 && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP)
- ---help---
- Enable the possibility of suspending the machine.
- It doesn't need ACPI or APM.
- You may suspend your machine by 'swsusp' or 'shutdown -z <time>'
- (patch for sysvinit needed).
+ 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 next
+ 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 argument. However, note
- that your partitions will be fsck'd and you must re-mkswap your swap
- partitions. It does not work with swap files.
+ 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
+ <file:Documentation/power/swsusp-and-swap-files.txt>).
- Right now you may boot without resuming and then later resume but
- in meantime you cannot use those swap partitions/files which were
- involved in suspending. Also in this case there is a risk that buffers
- on disk won't match with saved ones.
+ 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 <file:Documentation/power/swsusp.txt>.
+config ARCH_SAVE_PAGE_KEYS
+ bool
+
config PM_STD_PARTITION
string "Default resume partition"
- depends on SOFTWARE_SUSPEND
+ depends on HIBERNATION
default ""
---help---
The default resume partition is the partition that the suspend-
suspended image to. It will simply pick the first available swap
device.
-config SWSUSP_ENCRYPT
- bool "Encrypt suspend image"
- depends on SOFTWARE_SUSPEND && CRYPTO=y && (CRYPTO_AES=y || CRYPTO_AES_586=y || CRYPTO_AES_X86_64=y)
- default ""
+config PM_SLEEP
+ def_bool y
+ depends on SUSPEND || HIBERNATE_CALLBACKS
+
+config PM_SLEEP_SMP
+ def_bool y
+ depends on SMP
+ depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
+ depends on PM_SLEEP
+ select HOTPLUG
+ select HOTPLUG_CPU
+
+config PM_RUNTIME
+ bool "Run-time PM core functionality"
+ depends on !IA64_HP_SIM
---help---
- To prevent data gathering from swap after resume you can encrypt
- the suspend image with a temporary key that is deleted on
- resume.
+ Enable functionality allowing I/O devices to be put into energy-saving
+ (low power) states at run time (or autosuspended) after a specified
+ period of inactivity 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 the autosuspend requests and
+ wake-up events.
- Note that the temporary key is stored unencrypted on disk while the
- system is suspended.
+config PM
+ def_bool y
+ depends on PM_SLEEP || PM_RUNTIME
-config SUSPEND_SMP
+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 CAN_PM_TRACE
+ def_bool y
+ depends on PM_DEBUG && PM_SLEEP
+
+config PM_TRACE
bool
- depends on HOTPLUG_CPU && X86 && PM
- default y
+ 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 <linux/resume-trace.h> as well as the
+ <asm/resume-trace.h> 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 CAN_PM_TRACE
+ 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 PM && 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 <file:Documentation/power/apm-acpi.txt>
+ and the Battery Powered Linux mini-HOWTO, available from
+ <http://www.tldp.org/docs.html#howto>.
+
+ 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 ARCH_HAS_OPP
+ bool
+
+config PM_OPP
+ bool "Operating Performance Point (OPP) Layer library"
+ depends on ARCH_HAS_OPP
+ ---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 <file:Documentation/power/opp.txt>
+
+config PM_CLK
+ def_bool y
+ depends on PM && HAVE_CLK
+
+config PM_GENERIC_DOMAINS
+ bool
+ depends on PM
+
+config PM_GENERIC_DOMAINS_RUNTIME
+ def_bool y
+ depends on PM_RUNTIME && PM_GENERIC_DOMAINS
+
+config CPU_PM
+ bool
+ depends on SUSPEND || CPU_IDLE