[Bug 1663794] Re: Poweroff/Reboot Hangs :: Ubuntu 16.04

[Renê Barbosa]

** Attachment added: "dmesg.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1663794/+attachment/4816889/+files/dmesg.log

** Package changed: linux (Ubuntu) => systemd (Ubuntu)

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Title:
  Poweroff/Reboot Hangs :: Ubuntu 16.04

Status in systemd package in Ubuntu:
  New

Bug description:
  After upgrading my laptop (Dell Inspiron 5447) to Ubuntu 16.04 I saw
  that I can not shut down or restart after a few hours using the
  system. It hangs in Plymouth and stays that way until I force the
  shutdown by pressing the On / Off button.

  As this is a common bug (there are tons of questions on the Internet)
  I tried to fix it, but none of my attempts were effective. Already
  tried:

  1. Boot with acpi=force
  2. Disable Swap
  3. Run 'sync' before reboot or shutdown
  4. Use another kernel version (4.7, 4.8, 4.9 and 4.10 from mainline)
  5. Disabling USB 3.0
  6. Disabling TLP

  The most interesting thing is: I can shutdown/reboot normally using
  14.04 and the kernel from Xenial HWE and it's because of that I
  believe this is a systemd bug.

  The problem can also be reached just running "halt" of "systemctl
  halt" after booting 16.04 in this machine. Running these commands with
  "force" option is working fine.

  My Machine Specs:

  Dell Inspiron 5447 - BIOS A10
  Intel Core i5-4210 Processor
  8 GB RAM
  480 SSD Sandisk
  Hybrid Graphics (i915/amdgpu - Radeon R7 M265)

  --- BUG Information ----

  Reproducible:
  Always

  Steps to Reproduce:
  1.Power on the machine
  2.Do something, anything or nothing for a few hours
  3.Try to shutdown/reboot using halt, shutdown, reboot, etc

  Actual Results:
  The computer is not shutting down: "Reached target shutdown" and hangs there.

  Expected Results:
  Powering off/rebooting the machine.

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