Bug#973677: libkscreenlocker5: No login dialog is shown, user cannot unlock session

[Mikko Korhonen <mjkorhon@gmail.com>]

Package: libkscreenlocker5
Version: 5.17.5-2
Severity: grave
Justification: renders package unusable
X-Debbugs-Cc: mjkorhon@gmail.com

This is same as
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=852162
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=904074
but happens every time and at any unlock, not just on dehibernation and with a 
single monitor: only the cursor is shown on a black screen and there is no way to login.

As a workaround killing the process helps as the new instance shows the login screen.

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

Kernel: Linux 5.8.0-3-amd64 (SMP w/24 CPU threads)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=fi_FI.UTF-8, LC_CTYPE=fi_FI.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 libkscreenlocker5 depends on:
ii  kpackagetool5          5.74.0-2
ii  libc6                  2.31-4
ii  libkf5configcore5      5.74.0-2
ii  libkf5configgui5       5.74.0-2
ii  libkf5coreaddons5      5.74.0-2
ii  libkf5crash5           5.74.0-2
ii  libkf5declarative5     5.74.0-2
ii  libkf5globalaccel-bin  5.74.0-2
ii  libkf5globalaccel5     5.74.0-2
ii  libkf5i18n5            5.74.0-3
ii  libkf5idletime5        5.74.0-2
ii  libkf5notifications5   5.74.0-2
ii  libkf5package5         5.74.0-2
ii  libkf5quickaddons5     5.74.0-2
ii  libkf5waylandclient5   4:5.74.0-2
ii  libkf5waylandserver5   4:5.74.0-2
ii  libkf5windowsystem5    5.74.0-2
ii  libpam0g               1.3.1-5
ii  libqt5core5a           5.14.2+dfsg-6
ii  libqt5dbus5            5.14.2+dfsg-6
ii  libqt5gui5             5.14.2+dfsg-6
ii  libqt5network5         5.14.2+dfsg-6
ii  libqt5qml5             5.14.2+dfsg-3
ii  libqt5quick5           5.14.2+dfsg-3
ii  libqt5widgets5         5.14.2+dfsg-6
ii  libqt5x11extras5       5.14.2-2
ii  libseccomp2            2.4.4-1+b1
ii  libstdc++6             10.2.0-15
ii  libwayland-client0     1.18.0-2~exp1.1
ii  libwayland-server0     1.18.0-2~exp1.1
ii  libx11-6               2:1.6.12-1
ii  libxcb-keysyms1        0.4.0-1+b2
ii  libxcb1                1.14-2
ii  libxi6                 2:1.7.10-1
ii  psmisc                 23.3-1

Versions of packages libkscreenlocker5 recommends:
ii  kde-config-screenlocker  5.17.5-2

libkscreenlocker5 suggests no packages.

-- no debconf information