Same effect here as you described (Samsung Ativbook 7 730U3E with Intel/ATI graphic). Xubuntu 15.10 with all the updates worked. After upgrading to 16.04 suspend stopped working.
Due to some issues with systemd during the upgrade I did a fresh install of 16.04 Xubuntu but ran into the same suspend problem.
I hope you can fix this in the official Kernel as I'd like to stick to the "original" an 16.04 is a LTS version.
I guess petersaints gave enough information (thanks for this!) - I just want to push this with my vote :-)
Same effect here as you described (Samsung Ativbook 7 730U3E with Intel/ATI graphic). Xubuntu 15.10 with all the updates worked. After upgrading to 16.04 suspend stopped working.
Due to some issues with systemd during the upgrade I did a fresh install of 16.04 Xubuntu but ran into the same suspend problem.
I hope you can fix this in the official Kernel as I'd like to stick to the "original" an 16.04 is a LTS version.
I guess petersaints gave enough information (thanks for this!) - I just want to push this with my vote :-)