Lines Matching +full:suspend +full:- +full:to +full:- +full:disk
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.
23 bool "Skip kernel's sys_sync() on suspend to RAM/standby"
24 depends on SUSPEND
28 Some systems prefer not to pay this cost on every invocation
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
33 to change the default to disable the kernel sys_sync().
39 bool "Hibernation (aka 'suspend to disk')"
46 Enable the suspend to disk (STD) functionality, which is usually
50 You can suspend your machine with 'echo disk > /sys/power/state'
55 from <http://suspend.sf.net>.
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
64 boot, pass the 'resume=/dev/swappartition' argument to the kernel to
66 continue to run as before. If you do not want the previous state to
69 need to run mkswap against the swap partition used for the suspend.
71 It also works with swap files to a limited extent (for details see
72 <file:Documentation/power/swsusp-and-swap-files.rst>).
77 that were mounted before the suspend. In particular, you MUST NOT
78 MOUNT any journaled filesystems mounted before the suspend or they
100 The default resume partition is the partition that the suspend-
101 to-disk implementation will look for a suspended disk image.
111 which will set the resume partition to the device specified.
113 Note there is currently not a way to specify which device to save the
114 suspended image to. It will simply pick the first available swap
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
137 will allow nohz_full mask to include CPU0.
143 Allow the kernel to trigger a system transition into a global sleep
152 This option changes the behavior of various sleep-sensitive code to deal
153 with frequent userspace-initiated transitions into a global sleep state.
156 enabled. In particular, only enable this if it is very common to be
170 Allow user space to create, activate and deactivate wakeup source
171 objects with the help of a sysfs-based interface.
187 Enable functionality allowing I/O devices to be put into energy-saving
189 (autosuspended), and woken up in response to a hardware-generated
190 wake-up event or a driver's request.
192 Hardware support is generally required for this functionality to work
194 responsible for the actual handling of device suspend requests and
195 wake-up events.
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
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
221 You probably want to have your system's RTC driver statically
229 bool "Device suspend/resume watchdog"
232 Sets up a watchdog timer to capture drivers that are
233 locked up attempting to suspend/resume a device.
247 This enables code to save the last PM event point across
248 reboot. The architecture needs to support this, x86 for
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
275 set to an invalid time after a resume.
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
293 This driver does not spin down disk drives (see the hdparm(8)
295 VESA-compliant "green" monitors.
299 random kernel OOPSes or reboots that don't seem to be related to
312 bool "Enable workqueue power-efficient mode by default"
315 Per-cpu workqueues are generally preferred because they show
316 better performance thanks to cache locality; unfortunately,
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
347 can leverage information about the energy consumed by devices to
351 The exact usage of the energy model is subsystem-dependent.