Re: F40 hibernation issue

[Patrick O'Callaghan]

On Wed, 2024-05-01 at 18:21 +0200, Francis.Montagnac(a)inria.fr wrote:
>  On Wed, 01 May 2024 17:01:47 +0100 Patrick O'Callaghan wrote:
>  
>  > On Wed, 2024-05-01 at 14:42 +0200,
>  > Francis.Montagnac(a)inria.fr wrote:
>  > > On Wed, 01 May 2024 10:51:34 +0100 Patrick O'Callaghan wrote:
>  
>  > > > May 01 08:00:50 Bree kernel: Freezing user space processes
>  
>  > > > and hibernation did work. Possibly a timing issue, so I'll have
>  > > > to
>  > > > look at my hibernate-preparation script:
>  
>  > > Yes: simply replace ExecStart by ExecStartPre. This will make
>  > > systemd-hibernate surely start after this script.
>  
>  > > You don't need to specify an ExecStart.
>  
>  > I want to disable swap on zram0 and make sure it's enabled on
>  > secondary storage.
>  
>  I got that.
>  
>  > Do you mean that will happen automatically?
>  
>  No: your hibernate-preparation script is needed.
>  
>  systemd do not wait for an ExecStart command to finish before
>  starting
>  the next job (here systemd-hibernate.service).
>  
>  On the opposite, it waits for an ExecStartPre to finish before
>  executing the ExecStart.
>   
Yes,that makes sense.

>  I was wrong saying that an ExecStart was not needed.
>  
>  Try thus that:
>  
>      [Unit]
>      Description=Enable swap file and disable zram before hibernate
>      Before=systemd-hibernate.service
>  
>      [Service]
>      SyslogIdentifier=%N
>      User=root
>      Type=oneshot
>  
>      ExecStartPre=/bin/bash -c ' \
>              swapon -a; \
>              swapoff /dev/zram0; \
>              exit 0; \
>              '
>  
>      ExecStart=/bin/true
>  
>      [Install]
>      WantedBy=systemd-hibernate.service 
I'll try that, thanks.

poc