I tested Kernel 4.9.0-rc4 with more or less success, making it difficult
to determine precisely if it fixed this bug in particular. Among the
many problems encountered, however, none concerned hibernation.

Thanks for your help.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1633705

Title:
  Hibernation fails once in five

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  About every five hibernations, hardware keeps running and must be hard
  rebooted.

  syslog shows:
  systemd-sleep[15510]: /lib/systemd/system-sleep/wpasupplicant failed with 
error code 255.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-43-generic 4.4.0-43.63
  ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
  Uname: Linux 4.4.0-43-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  lsd        1891 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Oct 15 13:05:15 2016
  HibernationDevice: RESUME=UUID=57990468-bc20-4ec0-a7de-8849c1c3d5dd
  InstallationDate: Installed on 2016-07-16 (90 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  IwConfig:
   enp2s0    no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. H61M-S2P-B3
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-43-generic 
root=UUID=4b738246-b2fc-4d81-9831-65b2913d9169 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-43-generic N/A
   linux-backports-modules-4.4.0-43-generic  N/A
   linux-firmware                            1.157.4
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/04/2011
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F2
  dmi.board.name: H61M-S2P-B3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF2:bd08/04/2011:svnGigabyteTechnologyCo.,Ltd.:pnH61M-S2P-B3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnH61M-S2P-B3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: H61M-S2P-B3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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