Bug#887723: mate-screensaver: the screen stays darken and desktop not available anymore

[Joël Krähemann]

Package: mate-screensaver
Version: 1.18.2-1
Severity: serious
Justification: the desktop must be available

Dear Maintainer,

I have installed mate-desktop and its screensaver. The screen
stays darken after a while it was darken. Hitting my Logitech
USB wireless keyboard doesn't show up login screen.

Only way out is to restart lightdm:

`systemctl restart lightdm`

This possibily leads to data loss.

Best regards,
Joël

-- System Information:
Debian Release: buster/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.14.0-3-rt-amd64 (SMP w/24 CPU cores; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages mate-screensaver depends on:
ii  dbus-x11                  1.12.2-1
ii  libatk1.0-0               2.26.1-2
ii  libc6                     2.26-4
ii  libcairo-gobject2         1.15.8-3
ii  libcairo2                 1.15.8-3
ii  libdbus-1-3               1.12.2-1
ii  libdbus-glib-1-2          0.108-3
ii  libgdk-pixbuf2.0-0        2.36.11-1
ii  libgl1                    1.0.0-1
ii  libglib2.0-0              2.54.3-1
ii  libgtk-3-0                3.22.26-2
ii  libice6                   2:1.0.9-2
ii  libmate-desktop-2-17      1.18.0-1
ii  libmate-menu2             1.18.1-1
ii  libmatekbd4               1.18.2-1
ii  libnotify4                0.7.7-3
ii  libpam0g                  1.1.8-3.6
ii  libpango-1.0-0            1.40.14-1
ii  libpangocairo-1.0-0       1.40.14-1
ii  libsm6                    2:1.2.2-1+b3
ii  libstartup-notification0  0.12-5
ii  libsystemd0               236-3
ii  libx11-6                  2:1.6.4-3
ii  libxext6                  2:1.3.3-1+b2
ii  libxklavier16             5.4-3
ii  libxss1                   1:1.2.2-1+b2
ii  libxxf86vm1               1:1.1.4-1+b2
ii  mate-desktop-common       1.18.0-1
ii  mate-screensaver-common   1.18.2-1
ii  mate-session-manager      1.18.2-1

Versions of packages mate-screensaver recommends:
ii  mate-power-manager  1.18.1-2

Versions of packages mate-screensaver suggests:
pn  rss-glx            <none>
ii  xscreensaver-data  5.36-1

-- no debconf information