The log shows that something requests the suspend over D-Bus. The most probable candidate for this is logind. After this happens, can you please copy&paste the output of "journalctl -f -b -u systemd-logind" here? That should show key presses and which buttons it listens to.
To confirm that it's logind, could you check if that stops happening if you set HandleLidSwitch=ignore in /etc/systemd/logind.conf and then reboot? There's a chance that it isn't actually logind as we use the exact same logind and lid switch handling under upstart, just that we replace the actual suspend D-Bus interface with systemd-shim. Thanks! ** Changed in: systemd (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1438301 Title: desktop machine suspends with systemd after ~3 minutes, does NOT suspend with upstart To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1438301/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs