Ubuntu – Hibernate on Ubuntu (18.04) – s2disk working, but KDE buttons not

hibernatekubuntu

Summary

I can hibernate my system using s2disk, but not when using pm-hibernate or any KDE button. In latter case the system boots like it was a normal shutdown.
s2disk works, but when resuming I unfortunately have no password prompt.

Specs (though I had same issues on 17.10)

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04 LTS
Release:        18.04
Codename:       bionic
Linux 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Question

How can I either tell Kubuntu to use s2disk for hibernation, or tell pm-hibernate to use s2disk (assuming that this is the correct way).

Best Answer

How I could solve this issue:

As mentioned in my comment, I had to set the content of /sys/power/state to be disk.

sudo nano /sys/power/state

Insert disk. Then - for what reasons ever - the (at least mine) system goes to hibernate, and comes back directly.

Then I checked `settings --> Desktop Behaviour --> Activation --> "Lock screen on resume".

After that I've installed kscreenlocker-dev

sudo apt install kscreenlocker-dev

Once restarted, I could click on KDE's hibernate button and resume - including a password prompt - pretty fine.

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