Can you try again with v4.11-rc4? http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc4/
A new commit that seems related to the issue just land at -rc4: commit a733ded50b6ea846200073e7381a302df71e13b3 Author: Tomas Winkler <tomas.wink...@intel.com> Date: Sun Mar 5 21:40:41 2017 +0200 mei: fix deadlock on mei reset -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1663794 Title: Poweroff/Reboot Hangs :: Ubuntu 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1663794/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs