Long Wake Time from Sleep

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1

Hey,

I have installed NixOS 25.05 on my Lenovo Slim 7.

I have previously used Aeon Desktop on the same device, and my device would wake immediately from sleep, whereas on NixOS it takes around 20 seconds.

I was wondering if there is some way to find out what the problem is, and fix it.

Thanks.

2

Not any kind of expert on this, but hopefully the following will be something you can do to start looking for clues.

  1. Do a fresh reboot, just so you can be more sure everything is consistent
  2. Suspend, then resume
  3. journalctl -b -xu systemd-suspend to get the logs after the most recent boot relating to the suspend service, which will look something like:
Click to expand the logs 
Oct 21 10:20:00 hostname systemd[1]: Starting System Suspend...
░░ Subject: A start job for unit systemd-suspend.service has begun execution
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░ 
░░ A start job for unit systemd-suspend.service has begun execution.
░░ 
░░ The job identifier is 1190.
Oct 21 10:20:00 hostname systemd-sleep[1992]: Successfully froze unit 'user.slice'.
Oct 21 10:20:00 hostname systemd-sleep[1992]: Performing sleep operation 'suspend'...
░░ Subject: System sleep state suspend entered
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░ 
░░ The system has now entered the suspend sleep state.
Oct 21 10:20:15 hostname systemd-sleep[1992]: System returned from sleep operation 'suspend'.
░░ Subject: System sleep state suspend left
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░ 
░░ The system has now left the suspend sleep state.
Oct 21 10:20:15 hostname systemd-sleep[1992]: Successfully thawed unit 'user.slice'.
Oct 21 10:20:15 hostname systemd[1]: systemd-suspend.service: Deactivated successfully.
░░ Subject: Unit succeeded
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░ 
░░ The unit systemd-suspend.service has successfully entered the 'dead' state.
Oct 21 10:20:15 hostname systemd[1]: Finished System Suspend.
░░ Subject: A start job for unit systemd-suspend.service has finished successfully
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░ 
░░ A start job for unit systemd-suspend.service has finished successfully.
░░ 
░
  1. Ask for the systemctl logs since “Starting System Suspend…”, so journalctl -x -S 'Oct 21 10:20:00' in the case of the logs above.
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