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[Whit A <1434341@xxxxxxxxxxxxxxxxxx>]

Same behavior on my Thinkpad T450s.

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https://bugs.launchpad.net/bugs/1434341

Title:
  Intel HD5500: No video after suspend/resume cycle

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  Thinkpad T550, Vivid
  Suspend/resume works sometimes.
  On restore, no image on X. System apparently still active, because keyboard light (e.g. mute) still responding.
  Could not switch to console using ctrl-alt-f1.

  
  Thinkpad T550, Trusty
  Suspend/resume worked almost every time for 2 weeks.

  
  light-locker seems to screw things up by changing video modes, so I always remove that. Suspend/resume/lock/etc always fails with light-locker.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  Uname: Linux 3.19.0-9-generic x86_64
  ApportVersion: 2.16.2-0ubuntu3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Thu Mar 19 18:41:36 2015
  InstallationDate: Installed on 2015-03-05 (14 days ago)
  InstallationMedia: Xubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: Upgraded to vivid on 2015-03-19 (0 days ago)

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