I was experiencing the exact same issue on my Precision 7510 under Xenial, after transitioning to the rolling HWE & Kernel stack. On a hunch I added the Canonical Kernel Team PPA (https://launchpad.net /~canonical-kernel-team/+archive/ubuntu/ppa/+packages) so I could upgrade from kernel 4.8.0-36 to 4.8.0-37. Now shutdown and reboot are working perfectly. Not sure if I should file a separate bug report.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1659623 Title: Shutdown/reboot hang on Dell XPS 15 9550 BIOS 1.2.18+ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1659623/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
