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apport information

** Attachment added: "Lspci.txt"
   https://bugs.launchpad.net/bugs/1456531/+attachment/4476858/+files/Lspci.txt

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https://bugs.launchpad.net/bugs/1456531

Title:
  LightDM (?) blank/white screen after resume from suspend

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  On Xubuntu 15.04, when I suspend the machine and resume afterwards,
  the screen remains completely white/blank. I can move the mouse
  cursor, but I don't see any screen elements. Clicking or wildly
  pressing keys doesn't do anything.

  I can switch to a different console with Ctrl+Alt+F1 and log in, just
  fine.

  For this bug report, I have removed all files from /var/log/lightdm,
  then rebooted, suspended, resumed, and switched to VT1. Then copied
  the /var/log/lightdm files to a different location. See their contents
  attached to this bug report.

  Other parameters:

  - Simply locking and unlocking the screen works, ALTHOUGH I also see
  the white screen there at first, and have to click a mouse button for
  the login form to show up.

  - I'm running a system with a fully encrypted hard-drive and have
  configured LightDM to log me in automatically.

  - System is up-to-date.

  - No experimental packages, although I had an experimental version of
  xserver-xorg-video-intel running, but removed it shortly after.

  - System is a Thinkpad T450s with Intel HD 5500 graphics.

  Hope I didn't forget to mention anything important. If you need more information or want me to try something, let me know.
  --- 
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  lxg        2068 F.... pulseaudio
   /dev/snd/controlC0:  lxg        2068 F.... pulseaudio
  DistroRelease: Ubuntu 15.04
  InstallationDate: Installed on 2015-05-16 (134 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1)
  MachineType: LENOVO 20BXCTO1WW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-28-generic root=UUID=7247f3dc-87dc-460f-a4ec-7d049af66a36 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-28-generic N/A
   linux-backports-modules-3.19.0-28-generic  N/A
   linux-firmware                             1.143.3
  Tags:  vivid
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 3.19.0-28-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 04/20/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET48WW (1.13 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET48WW(1.13):bd04/20/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BXCTO1WW
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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