I tested with the upstream http://kernel.ubuntu.com/~kernel- ppa/mainline/v4.8-rc8 and that works!
Interestingly, once I rebooted again into my current kernel the problem disappeared! ** Tags added: kernel-fixed-upstream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1611088 Title: System fails to Suspend when on battery and HDMI connected device present To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1611088/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs