Comment 2 for bug 1768834

Hi Etienne,

Thanks for your quick reply and the suggestions! Please find the outputs below:

$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 16384 x 16384
eDP-1-1 connected (normal left inverted right x axis y axis)
   1920x1080 60.02 + 60.01 59.97 59.96 59.93
   1680x1050 59.95 59.88
   1600x1024 60.17
   1400x1050 59.98
   1600x900 59.99 59.94 59.95 59.82
   1280x1024 60.02
   1440x900 59.89
   1400x900 59.96 59.88
   1280x960 60.00
   1440x810 60.00 59.97
   1368x768 59.88 59.85
   1360x768 59.80 59.96
   1280x800 59.99 59.97 59.81 59.91
   1152x864 60.00
   1280x720 60.00 59.99 59.86 59.74
   1024x768 60.04 60.00
   960x720 60.00
   928x696 60.05
   896x672 60.01
   1024x576 59.95 59.96 59.90 59.82
   960x600 59.93 60.00
   960x540 59.96 59.99 59.63 59.82
   800x600 60.00 60.32 56.25
   840x525 60.01 59.88
   864x486 59.92 59.57
   800x512 60.17
   700x525 59.98
   800x450 59.95 59.82
   640x512 60.02
   720x450 59.89
   700x450 59.96 59.88
   640x480 60.00 59.94
   720x405 59.51 58.99
   684x384 59.88 59.85
   680x384 59.80 59.96
   640x400 59.88 59.98
   576x432 60.06
   640x360 59.86 59.83 59.84 59.32
   512x384 60.00
   512x288 60.00 59.92
   480x270 59.63 59.82
   400x300 60.32 56.34
   432x243 59.92 59.57
   320x240 60.05
   360x202 59.51 59.13
   320x180 59.84 59.32
DP-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
   1920x1200 59.60*+
   1920x1080 60.23
   1600x1200 60.12
   1280x1024 75.99 75.02 60.02
   1152x921 65.99
   1152x864 75.00
   1024x768 75.03 70.07 60.00
   832x624 74.55
   800x600 72.19 75.00 60.32 56.25
   640x480 75.00 72.81 66.67 59.94
   720x400 70.08
HDMI-1-2 disconnected (normal left inverted right x axis y axis)

$ inxi -G
Graphics: Card-1: Intel HD Graphics 5500
           Card-2: NVIDIA GM108M [GeForce 940M]
           Display Server: x11 (X.Org 1.19.6 ) drivers: modesetting,nvidia
           Resolution: 1920x1200@59.60hz
           OpenGL: renderer: GeForce 940M/PCIe/SSE2
           version: 4.6.0 NVIDIA 390.48

$ apt-cache policy mate-screensaver
mate-screensaver:
  Installed: 1.20.0-1
  Candidate: 1.20.0-1
  Version table:
 *** 1.20.0-1 500
        500 http://de.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy mate-screensaver
mate-screensaver:
  Installed: 1.20.0-1
  Candidate: 1.20.0-1
  Version table:
 *** 1.20.0-1 500
        500 http://de.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

$ gsettings list-recursively | grep -i screensaver
org.gnome.settings-daemon.plugins.media-keys screensaver '<Super>l'
org.mate.Marco.keybinding-commands command-1 'mate-screensaver-command --lock'
org.gnome.desktop.screensaver picture-opacity 100
org.gnome.desktop.screensaver logout-enabled false
org.gnome.desktop.screensaver lock-enabled true
org.gnome.desktop.screensaver logout-delay uint32 7200
org.gnome.desktop.screensaver embedded-keyboard-enabled false
org.gnome.desktop.screensaver primary-color '#023c88'
org.gnome.desktop.screensaver idle-activation-enabled true
org.gnome.desktop.screensaver secondary-color '#5789ca'
org.gnome.desktop.screensaver logout-command ''
org.gnome.desktop.screensaver color-shading-type 'solid'
org.gnome.desktop.screensaver embedded-keyboard-command ''
org.gnome.desktop.screensaver show-notifications false
org.gnome.desktop.screensaver picture-options 'zoom'
org.gnome.desktop.screensaver lock-delay uint32 0
org.gnome.desktop.screensaver show-full-name-in-top-bar true
org.gnome.desktop.screensaver picture-uri 'file:///usr/share/backgrounds/gnome/adwaita-lock.jpg'
org.gnome.desktop.screensaver status-message-enabled true
org.gnome.desktop.screensaver ubuntu-lock-on-suspend true
org.gnome.desktop.screensaver user-switch-enabled true
org.gnome.settings-daemon.plugins.screensaver-proxy active true
org.gnome.settings-daemon.plugins.screensaver-proxy priority 0
org.mate.SettingsDaemon.plugins.media-keys screensaver '<Control><Alt>l'
org.mate.power-manager lock-use-screensaver true
org.mate.screensaver logout-enabled false
org.mate.screensaver lock-enabled true
org.mate.screensaver embedded-keyboard-enabled false
org.mate.screensaver logout-delay 120
org.mate.screensaver idle-activation-enabled true
org.mate.screensaver themes @as []
org.mate.screensaver logout-command ''
org.mate.screensaver embedded-keyboard-command ''
org.mate.screensaver mode 'blank-only'
org.mate.screensaver power-management-delay 30
org.mate.screensaver lock-delay 1
org.mate.screensaver cycle-delay 10
org.mate.screensaver lock-dialog-theme 'default'
org.mate.screensaver status-message-enabled true
org.mate.screensaver user-switch-enabled true

$ grep -i screen /var/log/*log
...
/var/log/auth.log:May 3 17:31:48 t450stbg mate-screensaver-dialog: gkr-pam: unlocked login keyring
/var/log/auth.log:May 3 17:45:36 t450stbg mate-screensaver-dialog: gkr-pam: unlocked login keyring
/var/log/auth.log:May 3 17:50:20 t450stbg mate-screensaver-dialog: gkr-pam: unlocked login keyring
...
/var/log/syslog:May 3 17:31:48 t450stbg mate-screensaver-dialog: pam_ecryptfs: seteuid error
/var/log/syslog:May 3 17:45:36 t450stbg mate-screensaver-dialog: pam_ecryptfs: seteuid error
/var/log/syslog:May 3 17:50:20 t450stbg mate-screensaver-dialog: pam_ecryptfs: seteuid error

Please let me know if further log files might be of interest!

Thank you very much,
Tobias

PS: I should maybe add that I have deactivated the laptop screen when being connected to the external one.