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
134 If an arch can suspend (for suspend, hibernate, kexec, etc) on a
135 non-zero numbered CPU, it may define ARCH_SUSPEND_NONZERO_CPU. This
136 will allow nohz_full mask to include CPU0.
142 Allow the kernel to trigger a system transition into a global sleep
151 This option changes the behavior of various sleep-sensitive code to deal
152 with frequent userspace-initiated transitions into a global sleep state.
155 enabled. In particular, only enable this if it is very common to be
169 Allow user space to create, activate and deactivate wakeup source
170 objects with the help of a sysfs-based interface.
186 Enable functionality allowing I/O devices to be put into energy-saving
188 (autosuspended), and woken up in response to a hardware-generated
189 wake-up event or a driver's request.
191 Hardware support is generally required for this functionality to work
193 responsible for the actual handling of device suspend requests and
194 wake-up events.
202 suspend support.
205 bool "Extra PM attributes in sysfs for low-level debugging/testing"
208 Add extra sysfs attributes allowing one to access some Power Management
213 bool "Test suspend/resume and wakealarm during bootup"
214 depends on SUSPEND && PM_DEBUG && RTC_CLASS=y
216 This option will let you suspend your machine during bootup, and
220 You probably want to have your system's RTC driver statically
228 bool "Device suspend/resume watchdog"
231 Sets up a watchdog timer to capture drivers that are
232 locked up attempting to suspend/resume a device.
246 This enables code to save the last PM event point across
247 reboot. The architecture needs to support this, x86 for
251 functions from <linux/resume-trace.h> as well as the
252 <asm/resume-trace.h> header with a TRACE_RESUME() macro.
254 The way the information is presented is architecture-
259 bool "Suspend/resume event tracing"
264 This enables some cheesy code to save the last PM event point in the
266 during suspend (or more commonly, during resume).
268 To use this debugging feature you should attempt to suspend the
271 dmesg -s 1000000 | grep 'hash matches'
273 CAUTION: this option will cause your machine's real-time clock to be
274 set to an invalid time after a resume.
284 battery status information, and user-space programs will receive
287 In order to use APM, you will need supporting software. For location
288 and more information, read <file:Documentation/power/apm-acpi.rst>
289 and the Battery Powered Linux mini-HOWTO, available from
292 This driver does not spin down disk drives (see the hdparm(8)
294 VESA-compliant "green" monitors.
298 random kernel OOPSes or reboots that don't seem to be related to
311 bool "Enable workqueue power-efficient mode by default"
314 Per-cpu workqueues are generally preferred because they show
315 better performance thanks to cache locality; unfortunately,
316 per-cpu workqueues tend to be more power hungry than unbound
320 per-cpu workqueues which were observed to contribute
321 significantly to power consumption unbound, leading to measurably
346 can leverage information about the energy consumed by devices to
350 The exact usage of the energy model is subsystem-dependent.