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[TienFu Chen <tienfu.chen@xxxxxxxxxxxxx>]

@Robert:
I have built the package and tested on a system, but problem remains.
The /var/log/lightdm directory is attached for your reference.

I think it's not a machine-specified issue. I can duplicate it on many
machines on my site.


** Attachment added: "lightdm_log.tar.gz"
   https://bugs.launchpad.net/lightdm/+bug/1405349/+attachment/4356365/+files/lightdm_log.tar.gz

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

Title:
  switching to activated guest session causes screen blank

Status in Light Display Manager:
  Confirmed
Status in OEM Priority Project:
  Confirmed
Status in OEM Priority Project trusty series:
  Confirmed
Status in lightdm package in Ubuntu:
  Confirmed
Status in lightdm source package in Trusty:
  New

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.

  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
  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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