** Description changed:

  Hi,
  I switch to activated guest session, but the screen remains blank. I have to 
wake it up with keyboard/mouse action.
  
  How to reproduce:
  1. login with your account normally.
  2. switch to guest session from the panel menu "Switch Account... -> Guest 
Session", now it's under guest session and the display is normal.
  3. switch back to your user account, then switch to guest session again.
  4. The screen remains blank.
  
  Another method:
  1. sudo true && gdbus call --session --dest org.gnome.ScreenSaver \
       --object-path /com/canonical/Unity/Session --method \
       com.canonical.Unity.Session.ActivateScreenSaver && \
       sleep 1 && sudo chvt 1 && sleep 1 && sudo chvt 7
  
  I can't reproduce this issue under Precise.
  Vivid snapshot 22-Mar-2015 can also reproduce this issue.
  
  [Test Case]
  1. Run:
  sudo true && gdbus call --session --dest org.gnome.ScreenSaver \
       --object-path /com/canonical/Unity/Session --method \
       com.canonical.Unity.Session.ActivateScreenSaver && \
       sleep 1 && sudo chvt 1 && sleep 1 && sudo chvt 7
  2. Wait few seconds
  3. Make sure the screen is black
- 4. Move the mouse or type something with the keyboard
- 5. Make sure the screen the lockscreen is correctly restored
+ 4. When restored on tty7, the screen should be not blank anymore
  
  [Regression Potential]
  None
- 
  
  Package:
  lightdm 1.10.3-0ubuntu2
  unity-settings-daemon-14.04.0+14.10.20140606~0ubuntu1
  ---
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: Unity
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   
canonical-oem-stella-datong140729-kylin-trusty-amd64-20150205-2DistroRelease: 
Ubuntu 14.04
  InstallationDate: Installed on 2015-02-09 (1 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
  Package: lightdm 1.10.3-0ubuntu2
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 3.13.0-38.65stella1-generic 3.13.11.8
  Tags: trusty third-party-packages
  Uname: Linux 3.13.0-38-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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https://bugs.launchpad.net/bugs/1405349

Title:
  switching to activated guest session causes screen blank

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