reading through the logs, it seems unity8 requested the wakelock and never released it again.
https://paste.ubuntu.com/23111236/ I have now closed all the apps and it did release it 2016-08-30T12:20:19.466945+02:00 ubuntu-phablet repowerd[2431]: UnityScreenService: dbus_clearSysState(:1.76,486) ** Also affects: unity8 (Ubuntu) Importance: Undecided Status: New ** Changed in: unity8 (Ubuntu) Importance: Undecided => Critical -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1618380 Title: Device not going to deep sleep To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1618380/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs