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linux/systemd: added suspend and hibernate behaviour

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@ -64,6 +64,39 @@ This can be achieved by running the following command.
journalctl -b-1
```
### Change Suspend and Hibernate Behaviour
The behaviour of suspend and hibernation can be changed in the file `/etc/systemd/sleep.conf`.
One of the most important variables is the one to set the hibernation delay time.
This time will be used to determine the time that is taken from suspend to hibernation if
suspend-to-hibernate is called.
The following line will set this to 10 minutes.
```txt
HibernateDelaySec=10min
```
### Handle Power Key and Lid Seitch
The management of power keys and lid switches is handled in the file `/etc/systemd/logind.conf`.
The following line will set the behaviour of the power key to hibernate. The default for this would
be to shutdown the system.
```txt
HandlePowerKey=hibernate
```
The same can also be done to determine the action taken when the lid is closed.
By default the closing of the lid will result in suspending the system.
The following lines will change this to suspend-then-hibernate.
```txt
HandleLidSwitch=suspend-then-hibernate
```
For further behaviour of the suspend and hibernate actions check the
[corresponding section](#change-suspend-and-hibernate-behaviour).
## Troubleshooting
This section focusses on errors that correspond to the SystemD software.