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[TienFu Chen <tienfu.chen@xxxxxxxxxxxxx>]

I can't reproduce this issue on vivid 0323 image.

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https://bugs.launchpad.net/bugs/1431128

Title:
  screen remains blank after waking up from suspend

Status in OEM Priority Project:
  New
Status in OEM Priority Project trusty series:
  New
Status in lightdm package in Ubuntu:
  New
Status in lightdm source package in Trusty:
  New

Bug description:
  Steps:
  1. Suspend the computer by pressing the Sleep key(Fn+F2 on the keyboard here)
  2. Press any key on the keyboard or the Power button to wake the device up

  Expected results:
  1. The system suspends and the Power button LED blinks
  2. The system wakes up and user can log in.

  Actual results:
  1. The system suspends and the Power button LED blinks (OK)
  2. The login screen appears and the screen is immediately turned off (NOK). User needs to move the mouse or enter a key to turn the screen on.

  Additional information:

  - In a few additional occasions, after performing this action several
  times (pressing the Sleep key to suspend the system, then wake it up),
  the system freezes at log in screen just before going to suspend mode.
  It has to be force-stopped and restarted.

  - Please note that this problem does NOT happen when suspending from
  the User Menu or using the Power button and selecting Suspend.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: lightdm 1.10.4-0ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
  Uname: Linux 3.13.0-34-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  Date: Thu Mar 12 11:19:32 2015
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-stella-datong140729-kylin-trusty-amd64-20150205-2
  InstallationDate: Installed on 2015-02-10 (29 days ago)
  InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20150205-07:08
  LightdmConfig:
   [SeatDefaults]
   autologin-guest=false
   autologin-user-timeout=0
   autologin-session=lightdm-autologin
   #autologin-user=u
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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