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[Bug 1405349] Re: switching to activated guest session causes screen blank

 

** 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.
  
  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-amd64-20150205-2
- DistroRelease: Ubuntu 14.04
+  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

Status in OEM Priority Project:
  Confirmed
Status in OEM Priority Project trusty series:
  Confirmed
Status in Unity:
  In Progress
Status in Unity 7.2 series:
  In Progress
Status in unity package in Ubuntu:
  In Progress
Status in unity source package in Trusty:
  In Progress

Bug description:
  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.

  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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