In journalctl I found that whenever the machine reached suspend target, ACPI kicked in to wake the machine again.
kernel: ACPI: Low-level resume complete Today, I put the machine to sleep (using the alt option on the shutdown menu). The machine woke up every two seconds and went to sleep again (for over half an hour). Finally and for no obvious reason, the machine kept sleeping until I woke it up 3 hours later. Weired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1799038 Title: Ubuntu 18.10 does not suspend on lid close To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1799038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
