Hi, I just recently started using neon on a 2-year old Lenovo ThinkPad E550 with 12GB RAM (user-upgraded from factory-installed 4GB), and a user-installed 1TB Crucial SSD. Shutdown, suspend and hibernate are known to be working on Ubuntu MATE 16.10. I'm using neon from the neon-useredition-20170209-1018-amd64.iso, and because there's an SSD in it, I've set my laptop to shutdown when I close the lid; however, when I do so, it does not close but goes into suspend, only shutting down when I open it up again. I have no idea what other information might be required, but let me know and I'll add it in. Thanks, Jeff.
I am using a Dell Latitude E7240 on Neon 5.9.95 currently and I experience the same bug. I have had the same issue since I installed Neon when Plasma 5.6 had just come out. I'm afraid I don't have a fix
Now that Neon is based on 18.04, could you re-test this? Lots of power-related changes have made their way into the kernel since this report.
I am still experiencing it. I suspect it is actually something to do with my bios. I have noticed that I can suspend successfully once, following which when even the low battery suspend triggers a reboot rather. Hence I think that it is something to do with how my hardware is interacting with the kernel.
Thanks for the update!