I tested both 4.8.17 and 4.9.6 mainline kernel, shutdown/reboot both works fine there. However 4.8.0-34-generic Ubuntu kernel still has the problem.
I tested both 4.8.17 and 4.9.6 mainline kernel, shutdown/reboot both works fine there. However 4.8.0-34-generic Ubuntu kernel still has the problem.