Test case:
fwts --s4-device-check --s4-device-check-delay=45 --s4-sleep-delay=120 
--s4-multiple=30

Result:
Pass S4 hibernate/resume test 30 cycles.

** Attachment added: "results.log"
   
https://bugs.launchpad.net/hwe-next/+bug/1686061/+attachment/4887168/+files/results.log

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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https://bugs.launchpad.net/bugs/1686061

Title:
  Precision Rack failed to resume from S4

Status in HWE Next:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  On a Precision Rack with two CPUs, it failed to resume from S4 at ~70%
  rate.

  These two commits can fix the issue:

  commit 406f992e4a372dafbe3c2cff7efbb2002a5c8ebd
  Author: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
  Date:   Thu Jul 14 03:55:23 2016 +0200

      x86 / hibernate: Use hlt_play_dead() when resuming from
  hibernation

  
  commit e4630fdd47637168927905983205d7b7c5c08c09
  Author: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
  Date:   Mon Aug 8 15:31:31 2016 +0200

      x86/power/64: Always create temporary identity mapping correctly

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