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config PM

        bool "Power Management support"

        depends on !IA64_HP_SIM

        ---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  or

          Tuxmobil - Linux on Mobile Computers at 

          and the Battery Powered Linux mini-HOWTO, available from

          .

          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.

config PM_LEGACY

        bool "Legacy Power Management API (DEPRECATED)"

        depends on PM

        default n

        ---help---

           Support for pm_register() and friends.  This old API is obsoleted

           by the driver model.

           If unsure, say N.

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_VERBOSE

        bool "Verbose Power Management debugging"

        depends on PM_DEBUG

        default n

        ---help---

        This option enables verbose messages from the Power Management code.

config PM_TRACE

        bool "Suspend/resume event tracing"

        depends on PM_DEBUG && X86 && PM_SLEEP && EXPERIMENTAL

        default n

        ---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,

        then reboot it, 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 PM_SLEEP_SMP

        bool

        depends on SUSPEND_SMP_POSSIBLE || HIBERNATION_SMP_POSSIBLE

        depends on PM_SLEEP

        select HOTPLUG_CPU

        default y

config PM_SLEEP

        bool

        depends on SUSPEND || HIBERNATION

        default y

config SUSPEND_UP_POSSIBLE

        bool

        depends on (X86 && !X86_VOYAGER) || PPC || ARM || BLACKFIN || MIPS \

                   || SUPERH || FRV

        depends on !SMP

        default y

config SUSPEND_SMP_POSSIBLE

        bool

        depends on (X86 && !X86_VOYAGER) \

                   || (PPC && (PPC_PSERIES || PPC_PMAC)) || ARM

        depends on SMP

        default y

config SUSPEND

        bool "Suspend to RAM and standby"

        depends on PM

        depends on SUSPEND_UP_POSSIBLE || SUSPEND_SMP_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 (i.e. the ACPI S3 state).

config HIBERNATION_UP_POSSIBLE

        bool

        depends on X86 || PPC64_SWSUSP || PPC32

        depends on !SMP

        default y

config HIBERNATION_SMP_POSSIBLE

        bool

        depends on (X86 && !X86_VOYAGER) || PPC64_SWSUSP

        depends on SMP

        default y

config HIBERNATION

        bool "Hibernation (aka 'suspend to disk')"

        depends on PM && SWAP

        depends on HIBERNATION_UP_POSSIBLE || HIBERNATION_SMP_POSSIBLE

        ---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'.

          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 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.

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  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).