Сабж, при загрузке системы с подключенным вторым монитором, lightdm сыпет ошибками:
● lightdm.service - Light Display Manager
Loaded: loaded (/usr/lib/systemd/system/lightdm.service; enabled; vendor preset: disabled)
Active: active (running) since Fri 2017-02-24 09:23:23 EET; 1min 21s ago
Docs: man:lightdm(1)
Main PID: 380 (lightdm)
Tasks: 7 (limit: 4915)
CGroup: /system.slice/lightdm.service
├─380 /usr/bin/lightdm
├─388 /usr/lib/xorg-server/Xorg :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
└─473 lightdm --session-child 14 21
Feb 24 09:23:22 flappybook systemd[1]: Starting Light Display Manager...
Feb 24 09:23:23 flappybook systemd[1]: Started Light Display Manager.
Feb 24 09:23:23 flappybook lightdm[380]: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files
Feb 24 09:23:29 flappybook lightdm[380]: xrandr: Output DP1 is not disconnected but has no modes
Feb 24 09:23:29 flappybook lightdm[380]: xrandr: Output VGA1 is not disconnected but has no modes
Feb 24 09:23:29 flappybook lightdm[380]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Feb 24 09:23:29 flappybook lightdm[423]: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files
Feb 24 09:23:29 flappybook lightdm[423]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
cat /etc/lightdm/lightdm.conf
greeter-session=lightdm-gtk-greeter
display-setup-script=xrandr --output LVDS1 --primary
logind-check-graphical=true
xrandr
Screen 0: minimum 8 x 8, current 3286 x 1080, maximum 32767 x 32767
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 340mm x 190mm
1366x768 60.04*+
1280x720 60.00
1024x768 60.00
1024x576 60.00
960x540 60.00
800x600 60.32 56.25
864x486 60.00
640x480 59.94
720x405 60.00
680x384 60.00
640x360 60.00
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1920x1080+1366+0 (normal left inverted right x axis y axis) 470mm x 260mm
1920x1080 60.00*+ 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 74.98 59.90
1280x960 60.00
1280x800 59.91
1152x864 75.00
1280x720 60.00 50.00 59.94
1152x720 59.97
1024x768 75.03 60.00
832x624 74.55
800x600 75.00 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
P.S в тегах hdmi, потому, что через vga с другим монитором проблем не было. Правда это давненько тестировалось :)
P.P.S и раз пошла такая пляска, как в xfce запилить "Extend to the left"?
Что ему не нравиться?