Bug#1031983: light-locker: Fails to login a user back to her previous session (session lost, new one started)

[Dimitri Chausson <tri2000@gmx.net>]

Package: light-locker
Version: 1.8.0-3
Severity: important

Dear Maintainer,

I'll try to describe the issue as well as possible, even if I have no clue of
what happens.
After coming back to my workplace after a while, I see my screen locked. I am
prompted to type my password (the username is already filled). When the enter key is
pressed down, a kind of "re-init" takes place I see the login screen again, but
this time, I have to enter my username + password. I get logged in, but it is a
new session.. None of the applications left open before is active.

I tried to figure out what happens looking at the lightdm.log or
seat0-greeter.log files.

I configured xfce's power management section -> screen tab to:
- have an empty screen after 5 minutes
- put in standby after 10 minutes
- power off the screen after 15 minutes

My expectation is just to find my working session back after unlocking the
screen.
As a workaround, is there a way to disable screen lock with xfce ?

Thanks for your help

-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-5-amd64 (SMP w/8 CPU threads)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages light-locker depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.40.0-4
ii  libc6                                        2.36-8
ii  libcairo2                                    1.16.0-7
ii  libdbus-1-3                                  1.14.6-1
ii  libdbus-glib-1-2                             0.112-3
ii  libglib2.0-0                                 2.74.5-1
ii  libgtk-3-0                                   3.24.36-4
ii  libpango-1.0-0                               1.50.12+ds-1
ii  libpangocairo-1.0-0                          1.50.12+ds-1
ii  libsystemd0                                  252.5-2
ii  libx11-6                                     2:1.8.3-3
ii  libxext6                                     2:1.3.4-1+b1
ii  libxss1                                      1:1.2.3-1
ii  lightdm                                      1.26.0-8

light-locker recommends no packages.

light-locker suggests no packages.

-- no debconf information