Lines Matching +full:keep +full:- +full:power +full:- +full:in +full:- +full:suspend
1 # SPDX-License-Identifier: GPL-2.0-only
2 config SUSPEND config
3 bool "Suspend to RAM and standby"
7 Allow the system to enter sleep states in which main memory is
9 suspend-to-RAM state (e.g. the ACPI S3 state).
12 bool "Enable freezer for suspend to RAM/standby" \
14 depends on SUSPEND
17 This allows you to turn off the freezer for suspend. If this is
18 done, no tasks are frozen for suspend to RAM/standby.
20 Turning OFF this setting is NOT recommended! If in doubt, say Y.
23 bool "Skip kernel's sys_sync() on suspend to RAM/standby"
24 depends on SUSPEND
29 of suspend, or they are content with invoking sync() from
30 user-space before invoking suspend. There's a run-time switch
31 at '/sys/power/sync_on_suspend' to configure this behaviour.
32 This setting changes the default for the run-tim switch. Say Y
39 bool "Hibernation (aka 'suspend to disk')"
46 Enable the suspend to disk (STD) functionality, which is usually
47 called "hibernation" in user interfaces. STD checkpoints the
50 You can suspend your machine with 'echo disk > /sys/power/state'
52 in your bootloader's configuration file.
55 from <http://suspend.sf.net>.
57 In principle it does not require ACPI or APM, although for example
59 of the reasons to use software suspend is that the firmware hooks
60 for suspend states like suspend-to-RAM (STR) often don't work very
63 It creates an image which is saved in your active swap. Upon the next
69 need to run mkswap against the swap partition used for the suspend.
72 <file:Documentation/power/swsusp-and-swap-files.rst>).
74 Right now you may boot without resuming and resume later but in the
75 meantime you cannot use the swap partition(s)/file(s) involved in
76 suspending. Also in this case you must not use the filesystems
77 that were mounted before the suspend. In particular, you MUST NOT
78 MOUNT any journaled filesystems mounted before the suspend or they
79 will get corrupted in a nasty way.
81 For more information take a look at <file:Documentation/power/swsusp.rst>.
93 If in doubt, say Y.
100 The default resume partition is the partition that the suspend-
101 to-disk implementation will look for a suspended disk image.
119 depends on SUSPEND || HIBERNATE_CALLBACKS
135 If an arch can suspend (for suspend, hibernate, kexec, etc) on a
136 non-zero numbered CPU, it may define ARCH_SUSPEND_NONZERO_CPU. This
150 Notify kernel of aggressive userspace autosleep power management policy.
152 This option changes the behavior of various sleep-sensitive code to deal
153 with frequent userspace-initiated transitions into a global sleep state.
155 Saying Y here, disables code paths that most users really should keep
156 enabled. In particular, only enable this if it is very common to be
160 a userspace power manager service should enable this option; and not
171 objects with the help of a sysfs-based interface.
185 bool "Device power management core functionality"
187 Enable functionality allowing I/O devices to be put into energy-saving
188 (low power) states, for example after a specified period of inactivity
189 (autosuspended), and woken up in response to a hardware-generated
190 wake-up event or a driver's request.
194 responsible for the actual handling of device suspend requests and
195 wake-up events.
198 bool "Power Management Debug Support"
201 This option enables various debugging support in the Power Management
203 suspend support.
206 bool "Extra PM attributes in sysfs for low-level debugging/testing"
209 Add extra sysfs attributes allowing one to access some Power Management
211 developer interested in debugging/testing Power Management, say "no".
214 bool "Test suspend/resume and wakealarm during bootup"
215 depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
217 This option will let you suspend your machine during bootup, and
229 bool "Device suspend/resume watchdog"
233 locked up attempting to suspend/resume a device.
235 captured in pstore device for inspection in subsequent
239 int "Watchdog timeout in seconds"
249 example does by saving things in the RTC, see below.
252 functions from <linux/resume-trace.h> as well as the
253 <asm/resume-trace.h> header with a TRACE_RESUME() macro.
255 The way the information is presented is architecture-
260 bool "Suspend/resume event tracing"
265 This enables some cheesy code to save the last PM event point in the
267 during suspend (or more commonly, during resume).
269 To use this debugging feature you should attempt to suspend the
272 dmesg -s 1000000 | grep 'hash matches'
274 CAUTION: this option will cause your machine's real-time clock to be
278 tristate "Advanced Power Management Emulation"
281 APM is a BIOS specification for saving power using several different
285 battery status information, and user-space programs will receive
288 In order to use APM, you will need supporting software. For location
289 and more information, read <file:Documentation/power/apm-acpi.rst>
290 and the Battery Powered Linux mini-HOWTO, available from
295 VESA-compliant "green" monitors.
297 Generally, if you don't have a battery in your machine, there isn't
298 much point in using this driver and you should say N. If you get
301 APM in your BIOS).
312 bool "Enable workqueue power-efficient mode by default"
315 Per-cpu workqueues are generally preferred because they show
317 per-cpu workqueues tend to be more power hungry than unbound
321 per-cpu workqueues which were observed to contribute
322 significantly to power consumption unbound, leading to measurably
323 lower power usage at the cost of small performance overhead.
328 If in doubt, say N.
351 The exact usage of the energy model is subsystem-dependent.
353 If in doubt, say N.