config SUSPEND
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bool "Suspend to RAM and standby"
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depends on ARCH_SUSPEND_POSSIBLE
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default y
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---help---
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Allow the system to enter sleep states in which main memory is
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powered and thus its contents are preserved, such as the
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suspend-to-RAM state (e.g. the ACPI S3 state).
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config SUSPEND_FREEZER
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bool "Enable freezer for suspend to RAM/standby" \
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if ARCH_WANTS_FREEZER_CONTROL || BROKEN
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depends on SUSPEND
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default y
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help
|
This allows you to turn off the freezer for suspend. If this is
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done, no tasks are frozen for suspend to RAM/standby.
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Turning OFF this setting is NOT recommended! If in doubt, say Y.
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config SUSPEND_SKIP_SYNC
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bool "Skip kernel's sys_sync() on suspend to RAM/standby"
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depends on SUSPEND
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depends on EXPERT
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help
|
Skip the kernel sys_sync() before freezing user processes.
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Some systems prefer not to pay this cost on every invocation
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of suspend, or they are content with invoking sync() from
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user-space before invoking suspend. Say Y if that's your case.
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config HAS_WAKELOCK
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bool
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default y
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config WAKELOCK
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bool
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default y
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config HIBERNATE_CALLBACKS
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bool
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config HIBERNATION
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bool "Hibernation (aka 'suspend to disk')"
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depends on SWAP && ARCH_HIBERNATION_POSSIBLE
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select HIBERNATE_CALLBACKS
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select LZO_COMPRESS
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select LZO_DECOMPRESS
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select CRC32
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---help---
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Enable the suspend to disk (STD) functionality, which is usually
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called "hibernation" in user interfaces. STD checkpoints the
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system and powers it off; and restores that checkpoint on reboot.
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You can suspend your machine with 'echo disk > /sys/power/state'
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after placing resume=/dev/swappartition on the kernel command line
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in your bootloader's configuration file.
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Alternatively, you can use the additional userland tools available
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from <http://suspend.sf.net>.
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|
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
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of the reasons to use software suspend is that the firmware hooks
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for suspend states like suspend-to-RAM (STR) often don't work very
|
well with Linux.
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It creates an image which is saved in your active swap. Upon the next
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boot, pass the 'resume=/dev/swappartition' argument to the kernel to
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have it detect the saved image, restore memory state from it, and
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continue to run as before. If you do not want the previous state to
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be reloaded, then use the 'noresume' kernel command line argument.
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Note, however, that fsck will be run on your filesystems and you will
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need to run mkswap against the swap partition used for the suspend.
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It also works with swap files to a limited extent (for details see
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<file:Documentation/power/swsusp-and-swap-files.txt>).
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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
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suspending. Also in this case you must not use the filesystems
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that were mounted before the suspend. In particular, you MUST NOT
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MOUNT any journaled filesystems mounted before the suspend or they
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will get corrupted in a nasty way.
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For more information take a look at <file:Documentation/power/swsusp.txt>.
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config ARCH_SAVE_PAGE_KEYS
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bool
|
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config PM_STD_PARTITION
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string "Default resume partition"
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depends on HIBERNATION
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default ""
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---help---
|
The default resume partition is the partition that the suspend-
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to-disk implementation will look for a suspended disk image.
|
|
The partition specified here will be different for almost every user.
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It should be a valid swap partition (at least for now) that is turned
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on before suspending.
|
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The partition specified can be overridden by specifying:
|
|
resume=/dev/<other device>
|
|
which will set the resume partition to the device specified.
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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
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device.
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config PM_SLEEP
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def_bool y
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depends on SUSPEND || HIBERNATE_CALLBACKS
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select PM
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select SRCU
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config PM_SLEEP_SMP
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def_bool y
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depends on SMP
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depends on ARCH_SUSPEND_POSSIBLE || ARCH_HIBERNATION_POSSIBLE
|
depends on PM_SLEEP
|
select HOTPLUG_CPU
|
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config PM_AUTOSLEEP
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bool "Opportunistic sleep"
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depends on PM_SLEEP
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default n
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---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 && EXPERT
|
---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 120
|
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 <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 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 <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 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
|
|
config ENERGY_MODEL
|
bool "Energy Model for CPUs"
|
depends on SMP
|
depends on CPU_FREQ
|
default n
|
help
|
Several subsystems (thermal and/or the task scheduler for example)
|
can leverage information about the energy consumed by CPUs to make
|
smarter decisions. This config option enables the framework from
|
which subsystems can access the energy models.
|
|
The exact usage of the energy model is subsystem-dependent.
|
|
If in doubt, say N.
|
