Bug#1004060: systemd: breaks lightdm / lightdm-gtk-greeter

[Vincent Lefevre <vincent@vinc17.net>]

Something that may be important: in my /etc/X11/xorg.conf file,
I have:

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "DP-3: nvidia-auto-select +0+0, DP-4: nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

and in the /var/log/Xorg.0.log file:

[    23.807] (II) NVIDIA(0): Validated MetaModes:
[    23.807] (II) NVIDIA(0):     "DP-3:nvidia-auto-select+0+0,DP-4:nvidia-auto-select+0+0"
[    23.807] (II) NVIDIA(0): Virtual screen size determined to be 3840 x 2160
[    23.811] (--) NVIDIA(0): DPI set to (232, 240); computed from "UseEdidDpi" X config
[    23.811] (--) NVIDIA(0):     option
[    23.811] (II) NVIDIA: Using 6144.00 MB of virtual memory for indirect memory
[    23.811] (II) NVIDIA:     access.
[    23.843] (II) NVIDIA(0): Setting mode "DP-3:nvidia-auto-select+0+0,DP-4:nvidia-auto-select+0+0"

This is what selects the mirror mode for the two monitors.

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Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)