1SYSTEMD-SLEEP.CONF(5)         systemd-sleep.conf         SYSTEMD-SLEEP.CONF(5)
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NAME

6       systemd-sleep.conf, sleep.conf.d - Suspend and hibernation
7       configuration file
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SYNOPSIS

10       /etc/systemd/sleep.conf
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12       /etc/systemd/sleep.conf.d/*.conf
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14       /run/systemd/sleep.conf.d/*.conf
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16       /usr/lib/systemd/sleep.conf.d/*.conf
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DESCRIPTION

19       systemd supports four general power-saving modes:
20
21       suspend
22           a low-power state where execution of the OS is paused, and complete
23           power loss might result in lost data, and which is fast to enter
24           and exit. This corresponds to suspend, standby, or freeze states as
25           understood by the kernel.
26
27       hibernate
28           a low-power state where execution of the OS is paused, and complete
29           power loss does not result in lost data, and which might be slow to
30           enter and exit. This corresponds to the hibernation as understood
31           by the kernel.
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33       hybrid-sleep
34           a low-power state where execution of the OS is paused, which might
35           be slow to enter, and on complete power loss does not result in
36           lost data but might be slower to exit in that case. This mode is
37           called suspend-to-both by the kernel.
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39       suspend-then-hibernate
40           A low power state where the system is initially suspended (the
41           state is stored in RAM). If the system supports low-battery alarms
42           (ACPI _BTP), then the system will be woken up by the ACPI
43           low-battery signal and hibernated (the state is then stored on
44           disk). Also, if not interrupted within the timespan specified by
45           HibernateDelaySec= or the estimated timespan until the system
46           battery charge level goes down to 5%, then the system will be woken
47           up by the RTC alarm and hibernated. The estimated timespan is
48           calculated from the change of the battery capacity level after the
49           time specified by SuspendEstimationSec= or when the system is woken
50           up from the suspend.
51
52       Settings in these files determine what strings will be written to
53       /sys/power/disk and /sys/power/state by systemd-sleep(8) when
54       systemd(1) attempts to suspend or hibernate the machine. See
55       systemd.syntax(7) for a general description of the syntax.
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CONFIGURATION DIRECTORIES AND PRECEDENCE

58       The default configuration is set during compilation, so configuration
59       is only needed when it is necessary to deviate from those defaults.
60       Initially, the main configuration file in /etc/systemd/ contains
61       commented out entries showing the defaults as a guide to the
62       administrator. Local overrides can be created by editing this file or
63       by creating drop-ins, as described below. Using drop-ins for local
64       configuration is recommended over modifications to the main
65       configuration file.
66
67       In addition to the "main" configuration file, drop-in configuration
68       snippets are read from /usr/lib/systemd/*.conf.d/,
69       /usr/local/lib/systemd/*.conf.d/, and /etc/systemd/*.conf.d/. Those
70       drop-ins have higher precedence and override the main configuration
71       file. Files in the *.conf.d/ configuration subdirectories are sorted by
72       their filename in lexicographic order, regardless of in which of the
73       subdirectories they reside. When multiple files specify the same
74       option, for options which accept just a single value, the entry in the
75       file sorted last takes precedence, and for options which accept a list
76       of values, entries are collected as they occur in the sorted files.
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78       When packages need to customize the configuration, they can install
79       drop-ins under /usr/. Files in /etc/ are reserved for the local
80       administrator, who may use this logic to override the configuration
81       files installed by vendor packages. Drop-ins have to be used to
82       override package drop-ins, since the main configuration file has lower
83       precedence. It is recommended to prefix all filenames in those
84       subdirectories with a two-digit number and a dash, to simplify the
85       ordering of the files.
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87       To disable a configuration file supplied by the vendor, the recommended
88       way is to place a symlink to /dev/null in the configuration directory
89       in /etc/, with the same filename as the vendor configuration file.
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OPTIONS

92       The following options can be configured in the [Sleep] section of
93       /etc/systemd/sleep.conf or a sleep.conf.d file:
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95       AllowSuspend=, AllowHibernation=, AllowSuspendThenHibernate=,
96       AllowHybridSleep=
97           By default any power-saving mode is advertised if possible (i.e.
98           the kernel supports that mode, the necessary resources are
99           available). Those switches can be used to disable specific modes.
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101           If AllowHibernation=no or AllowSuspend=no is used, this implies
102           AllowSuspendThenHibernate=no and AllowHybridSleep=no, since those
103           methods use both suspend and hibernation internally.
104           AllowSuspendThenHibernate=yes and AllowHybridSleep=yes can be used
105           to override and enable those specific modes.
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107       SuspendMode=, HibernateMode=, HybridSleepMode=
108           The string to be written to /sys/power/disk by, respectively,
109           systemd-suspend.service(8), systemd-hibernate.service(8), or
110           systemd-hybrid-sleep.service(8). More than one value can be
111           specified by separating multiple values with whitespace. They will
112           be tried in turn, until one is written without error. If none of
113           the writes succeed, the operation will be aborted.
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115           The allowed set of values is determined by the kernel and is shown
116           in the file itself (use cat /sys/power/disk to display). See the
117           kernel documentation[1] for more details.
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119           systemd-suspend-then-hibernate.service(8) uses the value of
120           SuspendMode= when suspending and the value of HibernateMode= when
121           hibernating.
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123       SuspendState=, HibernateState=, HybridSleepState=
124           The string to be written to /sys/power/state by, respectively,
125           systemd-suspend.service(8), systemd-hibernate.service(8), or
126           systemd-hybrid-sleep.service(8). More than one value can be
127           specified by separating multiple values with whitespace. They will
128           be tried in turn, until one is written without error. If none of
129           the writes succeed, the operation will be aborted.
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131           The allowed set of values is determined by the kernel and is shown
132           in the file itself (use cat /sys/power/state to display). See the
133           kernel documentation[1] for more details.
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135           systemd-suspend-then-hibernate.service(8) uses the value of
136           SuspendState= when suspending and the value of HibernateState= when
137           hibernating.
138
139       HibernateDelaySec=
140           The amount of time the system spends in suspend mode before the
141           system is automatically put into hibernate mode. Only used by
142           systemd-suspend-then-hibernate.service(8). If the system has a
143           battery, then defaults to the estimated timespan until the system
144           battery charge level goes down to 5%. If the system has no battery,
145           then defaults to 2h.
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147       SuspendEstimationSec=
148           The RTC alarm will wake the system after the specified timespan to
149           measure the system battery capacity level and estimate battery
150           discharging rate, which is used for estimating timespan until the
151           system battery charge level goes down to 5%. Only used by systemd-
152           suspend-then-hibernate.service(8). Defaults to 1h.
153

EXAMPLE: FREEZE

155       Example: to exploit the “freeze” mode added in Linux 3.9, one can use
156       systemctl suspend with
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158           [Sleep]
159           SuspendState=freeze
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SEE ALSO

162       systemd-sleep(8), systemd-suspend.service(8), systemd-
163       hibernate.service(8), systemd-hybrid-sleep.service(8), systemd-suspend-
164       then-hibernate.service(8), systemd(1), systemd.directives(7)
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NOTES

167        1. the kernel documentation
168           https://www.kernel.org/doc/html/latest/admin-guide/pm/sleep-states.html#basic-sysfs-interfaces-for-system-suspend-and-hibernation
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172systemd 253                                              SYSTEMD-SLEEP.CONF(5)
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