1SYSTEMD-SLEEP.CONF(5) systemd-sleep.conf SYSTEMD-SLEEP.CONF(5)
2
6 systemd-sleep.conf, sleep.conf.d - Suspend and hibernation
7 configuration file
8
10 /etc/systemd/sleep.conf
11 /etc/systemd/sleep.conf.d/*.conf
13 /run/systemd/sleep.conf.d/*.conf
15 /usr/lib/systemd/sleep.conf.d/*.conf
17
19 systemd supports four general power-saving modes:
20 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 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.
32 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.
38 suspend-then-hibernate
40 A low power state where the system is initially suspended (the
41 state is stored in RAM). If not interrupted within the delay
42 specified by HibernateDelaySec=, the system will be woken using an
43 RTC alarm and hibernated (the state is then stored on disk).
44 Settings in these files determine what strings will be written to
46 /sys/power/disk and /sys/power/state by systemd-sleep(8) when
47 systemd(1) attempts to suspend or hibernate the machine. See
48 systemd.syntax(5) for a general description of the syntax.
49
51 The default configuration is defined during compilation, so a
52 configuration file is only needed when it is necessary to deviate from
53 those defaults. By default, the configuration file in /etc/systemd/
54 contains commented out entries showing the defaults as a guide to the
55 administrator. This file can be edited to create local overrides.
56 When packages need to customize the configuration, they can install
58 configuration snippets in /usr/lib/systemd/*.conf.d/. Files in /etc/
59 are reserved for the local administrator, who may use this logic to
60 override the configuration files installed by vendor packages. The main
61 configuration file is read before any of the configuration directories,
62 and has the lowest precedence; entries in a file in any configuration
63 directory override entries in the single configuration file. Files in
64 the *.conf.d/ configuration subdirectories are sorted by their filename
65 in lexicographic order, regardless of which of the subdirectories they
66 reside in. When multiple files specify the same option, for options
67 which accept just a single value, the entry in the file with the
68 lexicographically latest name takes precedence. For options which
69 accept a list of values, entries are collected as they occur in files
70 sorted lexicographically. It is recommended to prefix all filenames in
71 those subdirectories with a two-digit number and a dash, to simplify
72 the ordering of the files.
73 To disable a configuration file supplied by the vendor, the recommended
75 way is to place a symlink to /dev/null in the configuration directory
76 in /etc/, with the same filename as the vendor configuration file.
77
79 The following options can be configured in the "[Sleep]" section of
80 /etc/systemd/sleep.conf or a sleep.conf.d file:
81 AllowSuspend=, AllowHibernation=, AllowSuspendThenHibernate=,
83 AllowHybridSleep=
84 By default any power-saving mode is advertised if possible (i.e.
85 the kernel supports that mode, the necessary resources are
86 available). Those switches can be used to disable specific modes.
87 If AllowHibernation=no or AllowSuspend=no is used, this implies
89 AllowSuspendThenHibernate=no and AllowHybridSleep=no, since those
90 methods use both suspend and hibernation internally.
91 AllowSuspendThenHibernate=yes and AllowHybridSleep=yes can be used
92 to override and enable those specific modes.
93 SuspendMode=, HibernateMode=, HybridSleepMode=
95 The string to be written to /sys/power/disk by, respectively,
96 systemd-suspend.service(8), systemd-hibernate.service(8), systemd-
97 hybrid-sleep.service(8), or systemd-suspend-then-
98 hibernate.service(8). More than one value can be specified by
99 separating multiple values with whitespace. They will be tried in
100 turn, until one is written without error. If neither succeeds, the
101 operation will be aborted.
102 SuspendState=, HibernateState=, HybridSleepState=
104 The string to be written to /sys/power/state by, respectively,
105 systemd-suspend.service(8), systemd-hibernate.service(8), systemd-
106 hybrid-sleep.service(8), or systemd-suspend-then-
107 hibernate.service(8). More than one value can be specified by
108 separating multiple values with whitespace. They will be tried in
109 turn, until one is written without error. If neither succeeds, the
110 operation will be aborted.
111 HibernateDelaySec=
113 The amount of time in seconds that will pass before the system is
114 automatically put into hibernate when using systemd-suspend-then-
115 hibernate.service(8).
116
118 Example: to exploit the “freeze” mode added in Linux 3.9, one can use
119 systemctl suspend with
120 [Sleep]
122 SuspendState=freeze
123
125 systemd-sleep(8), systemd-suspend.service(8), systemd-
126 hibernate.service(8), systemd-hybrid-sleep.service(8), systemd-suspend-
127 then-hibernate.service(8), systemd(1), systemd.directives(7)
128systemd 239 SYSTEMD-SLEEP.CONF(5)