Have now tried using 4.14 kernel with Ubuntu 18.04 and it fixes the problem. Using a 4.14 kernel with Ubuntu 18.04 and Kubuntu 18.04 allows suspend to work as it should.
In the case of Ubuntu 18.04, it is the same for Ubuntu on X or Wayland. i.e both fail on a 4.15+ kernel and both work using kernel 4.14.47 (Have tried Ubuntu 18.04 with the latest 4.17 kernel from UKUU as well and it still fails to suspend, so feel sure that kernel-bug-exists- upstream ) ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1774950 Title: Suspend fails in Ubuntu and Kubuntu 18.04 but works fine in Ubuntu and Kubuntu 17.10 (and on Kubuntu 18.04 using kernel 4.14.47) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1774950/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs