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[Pinghao Qi <feifeiqph@xxxxxxxxx>]

pm-suspend.log shows this error line. Everything else is success.

Running hook /usr/lib/pm-utils/sleep.d/60_wpa_supplicant suspend suspend:
Failed to connect to non-global ctrl_ifname: (null)  error: No such file or directory
/usr/lib/pm-utils/sleep.d/60_wpa_supplicant suspend suspend: success.

It seems this bug has been reported in many places since a long time
ago.

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https://bugs.launchpad.net/bugs/1449357

Title:
  Thinkpad T450s unable to resume after suspended for a long time

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My laptop shows a black screen when resumes from suspend. I'm unable
  to log in with ctrl-alt-f1 then ctrl-alt-f7. I'm able to control the
  keyboard backlight, the LED on the power button still looks like the
  way the laptop is in suspend. I'm only able to log in by pressing the
  power button and power off.

  This issue only happens when I close the lid and leave the computer
  for a long time. If I close the lid and open it in around 1 minute, it
  resumes just fine. I have to press the suspend button in the drop down
  menu to suspend the laptop first, and then close the lid. In that
  case, the laptop resumes without error. I've set in the power settings
  to let the laptop do nothing when lid is closed, and that didn't
  change the problem.

  The laptop only has an Intel integrated graphics card. I've tried using the newest i915 driver from o1.org and the same problem persists. This same problem is observed in clean installs of 14.04LTS, 14.10 and 15.04. I updated to 15.04 from 14.10 using the built-in updater. 
  The laptop runs the newest version of BIOS from Lenovo.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-15-generic 3.19.0-15.15
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  pinghao    3446 F.... pulseaudio
   /dev/snd/controlC0:  pinghao    3446 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Apr 27 23:44:32 2015
  HibernationDevice: RESUME=UUID=72731580-3c1d-4d92-8d3d-c07fd1031447
  InstallationDate: Installed on 2015-04-16 (11 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20BX001LUS
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-04-24 (3 days ago)
  dmi.bios.date: 03/10/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET47WW (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BX001LUS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET47WW(1.12):bd03/10/2015:svnLENOVO:pn20BX001LUS:pvrThinkPadT450s:rvnLENOVO:rn20BX001LUS:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BX001LUS
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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