When I lock ubuntu 14.04.2, all applications opened (complete session) crashed

[Sajid Ali Mudassar]

Freshly installed ubuntu 14.04.2 with full updates.

When I lock my desktop session, desktop halts for a couple of seconds, then session is locked, but I am taken back to Login screen.
When I login, than Lock is presented, and when I unlock by providing password, all my previous session is gone, all applications crashed/closed. Its like when I just logged in for the first time, but with a twist that even the applications that were setup to be opened on startup like Skype are not auto started after this issue happen. [skype does autostart on normal login, as its added in startup applications list]

I expect normal lock and unlock experience, not logout experience when locking.

Using fglrx or X.Org open source display driver gives same issue.

I am using HP ProBook 450 G2.

Same issue was happening on 14.04.1. Same issue is happening on all of our same modal laptops, so for sure its a bug somewhere.

Let me know if anyone needs more information or logs etc. I will try my best to provide these details.

LIghtDM version is: 1.10.5-0ubuntu1

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.10.5-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10
Uname: Linux 3.16.0-38-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jun 9 10:29:39 2015
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Rahat Ali Khan (rahatali-khan)]

I have also faced the same issue of application closing after "Unlock" using Ubuntu 14.04.01 on HP ProBook 450 G2

Rahat Ali Khan

[Muhammad Zulqarnain (mzulqarnain2002)]

same issue with 14.04.1 on hp probook g2 64bit

[mysub123 (ali-hussain)]

I am having this issue from past more then 30+ Days. I tried many workarounds but point to mention is my output suffers a lot due to this issue.

@Admin: Please also rate the effective panic creating ranking as well.

I have Ubuntu 14.04 kernel 3.13.0-53-generic #89-Ubuntu SMP

[Bo Christensen (aquabo-dk)]

I can confirm this bug on my:

Compaq C700
CPU: Intel Pentium Dual CPU T2310 @ 1.467GHz -
GPU: Intel Mobile GM965/GL960
OS: Ubuntu 14.04 trusty
Kernel: i686 Linux 3.16.0-38-generic

I DO NOT have the problem on my:

Lenovo Thinkpad Edge E125
CPU: AMD E-450 APU with Radeo HD Graphics @ 1.65GHz
GPU AMD/ATI Wrestler [Radeon HD 6320]
OS: Ubuntu 14.04 trusty
Kernel: x86_64 Linux 3.13.0-54-generic