Frequently Asked Questions


How to check unsupported software?

In case you want to detect if some piece of software running on your system that is not officially supported is performing relevant activity you have two options:

  • Use a script with the ExternalCommand check.

  • Implement a Python module with you check being a subclass of autosuspend.checks.Activity or autosuspend.checks.Wakeup and install it alongside autosuspend. The custom check class can then be referenced in the config with its full dotted path, for instance, mymodule.MyCheck, in the class field.

How do I wake up my system if needed?

autosuspend itself only handles wake ups for events that were foreseeable at the time the system was put into sleep mode. In case the system also has to be used on-demand, a simple way to wake up the system is to enable Wake on LAN. Here, a special network packet can be used to wake up the system again. Multiple front-ends exist to send these magic packets. The typical usage scenario with this approach is to manually send the magic packet when the system is needed, wait a few seconds, and then to perform the intended tasks with the system.

Wake on LAN needs to be specifically enabled on the system. Typically, the documentation of common Linux distributions explains how to enable Wake on LAN:

A set of front-ends for various platforms allows sending the magic packets. For instance:

How do I keep a system active at daytime

Imagine you want to have a NAS that is always available between 7 a.m. and 8 p.m. After 8 p.m. the system should go to sleep in case no one else is using it. Every morning at 7 a.m. it should wake up automatically. This workflow can be realized using the Calendar wakeup check and the ActiveCalendarEvent activity check based on an iCalendar file residing on the local file system of the NAS. The former check ensures that the system wakes up at the desired time of the day while the latter ensure that it stays active at daytime.

The first step is to create the iCalendar file, which can conveniently and graphically be edited with Thunderbird Lightning or any other calendar frontend. Essentially, the *.ics may look like this:

PRODID:-// Mozilla Calendar V1.1//EN
SUMMARY:keep active

Afterwards, edit autosuspend.conf to contain the two aforementioned checks based on the created ics file. This will end up with at least this config:

interval = 30
suspend_cmd = /usr/bin/systemctl suspend
wakeup_cmd = echo {timestamp:.0f} > /sys/class/rtc/rtc0/wakealarm
woke_up_file = /var/run/autosuspend-just-woke-up

enabled = true
url = file:///path/to/your.ics

enabled = true
url = file:///path/to/your.ics

Adding other activity checks will ensure that the system stays awake event after 8 p.m. if it is still used.

Error messages

No connection adapters were found for ‘file://*’

You need to install the requests-file package for file:// URIs to work.