systemd-sleep.conf

systemd
systemd-sleep.conf 5
systemd-sleep.conf sleep.conf.d Suspend and hibernation configuration file

`/etc/systemd/sleep.conf`

`/etc/systemd/sleep.conf.d/*.conf`

`/run/systemd/sleep.conf.d/*.conf`

`/usr/lib/systemd/sleep.conf.d/*.conf`

## Description

`systemd` supports four general power-saving modes:

suspend

  a low-power state where execution of the OS is paused, and complete power loss might result in lost data, and which is fast to enter and exit. This corresponds to suspend, standby, or freeze states as understood by the kernel.

hibernate

  a low-power state where execution of the OS is paused, and complete power loss does not result in lost data, and which might be slow to enter and exit. This corresponds to the hibernation as understood by the kernel.

hybrid-sleep

  a low-power state where execution of the OS is paused, which might be slow to enter, and on complete power loss does not result in lost data but might be slower to exit in that case. This mode is called suspend-to-both by the kernel.

suspend-then-hibernate

  A low power state where the system is initially suspended (the state is stored in RAM). If not interrupted within the delay specified by `HibernateDelaySec=`, the system will be woken using an RTC alarm and hibernated (the state is then stored on disk).

Settings in these files determine what strings will be written to `/sys/power/disk` and `/sys/power/state` by systemd-sleep 8 when systemd 1 attempts to suspend or hibernate the machine. See systemd.syntax 7 for a general description of the syntax.

## Options

The following options can be configured in the [Sleep] section of `/etc/systemd/sleep.conf` or a `sleep.conf.d` file:

`AllowSuspend=`
`AllowHibernation=`
`AllowSuspendThenHibernate=`
`AllowHybridSleep=`

  By default any power-saving mode is advertised if possible (i.e. the kernel supports that mode, the necessary resources are available). Those switches can be used to disable specific modes.

  If `AllowHibernation=no` or `AllowSuspend=no` is used, this implies `AllowSuspendThenHibernate=no` and `AllowHybridSleep=no`, since those methods use both suspend and hibernation internally. `AllowSuspendThenHibernate=yes` and `AllowHybridSleep=yes` can be used to override and enable those specific modes.

`SuspendMode=`
`HibernateMode=`
`HybridSleepMode=`

  The string to be written to `/sys/power/disk` by, respectively, systemd-suspend.service 8, systemd-hibernate.service 8, or systemd-hybrid-sleep.service 8. More than one value can be specified by separating multiple values with whitespace. They will be tried in turn, until one is written without error. If neither succeeds, the operation will be aborted.

  systemd-suspend-then-hibernate.service 8 uses the value of `SuspendMode=` when suspending and the value of `HibernateMode=` when hibernating.

`SuspendState=`
`HibernateState=`
`HybridSleepState=`

  The string to be written to `/sys/power/state` by, respectively, systemd-suspend.service 8, systemd-hibernate.service 8, or systemd-hybrid-sleep.service 8. More than one value can be specified by separating multiple values with whitespace. They will be tried in turn, until one is written without error. If neither succeeds, the operation will be aborted.

  systemd-suspend-then-hibernate.service 8 uses the value of `SuspendState=` when suspending and the value of `HibernateState=` when hibernating.

`HibernateDelaySec=`

  The amount of time the system spends in suspend mode before the system is automatically put into hibernate mode, when using systemd-suspend-then-hibernate.service 8. Defaults to 2h.

## Example: freeze

Example: to exploit the freeze mode added in Linux 3.9, one can use `systemctl suspend` with

    [Sleep]
    SuspendState=freeze

## See Also

systemd-sleep 8, systemd-suspend.service 8, systemd-hibernate.service 8, systemd-hybrid-sleep.service 8, systemd-suspend-then-hibernate.service 8, systemd 1, systemd.directives 7