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I would like to understand what is wrong with my linux system (or hardware). Sometimes I lose my session when the system is suspended, instead, it restarts then instantly without restoring anything.

I managed to find out the following:

    • pm-suspend: worked always
    • echo -n mem >/sys/power/state (invoked by pm-suspend): worked always
  2. suspension when closing the lid: works most of the time
  3. suspension after x minutes idling: does crash most of the time
  4. systemctl suspend does work sometimes, sometimes is crashes my session.
  5. /lib/systemd/systemd-sleep suspend, which is invoked by systemctl suspend (as it seems) works just as often as the command above

What's the difference between those commands/actions? why is pm-suspend reliable but the others are not? How can I get a verbose log?

Could someone explain me how sending the system into suspend mode works currently? I am on Ubuntu 21.10 but I guess a general explanation would be fine too.

I just need a hint to get started somewhere :)

tollo
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  • Look at my answer - it might help you – kanehekili Nov 30 '21 at 22:24
  • I suggest updating UEFI before any further troubleshooting. – ChanganAuto Nov 30 '21 at 22:33
  • UEFI is, unfortunately, already at its latest version. – tollo Nov 30 '21 at 22:40
  • The question itself was quite helpful, especially seeing the -n on echo. I also discovered I need to sleep for a couple seconds in order to avoid thinking I'm already awake. In case it may be of help to others, my implementation is here: https://github.com/JeffAbrahamson/dotfiles/blob/master/i3/i3/bin/i3-lock-suspend – jma Dec 26 '21 at 09:02

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