My aim is to have two seats for my Ubuntu machine. One of the monitors is a USB touchscreen from Mimo with a displaylink chip. I already got it working as main display just by reconfiguring xorg.conf. Even the touch interface works.

But for multiseats, it's not just enough to change xorg.conf, because additional login screens have to be started too. This has to go into the lightdm configuration.

By configuring lightdm for multiseats (lightdm.conf), I managed to start up two X instances, one for each ServerLayout (xorg.conf). One is running on Virtual Terminal 7 (VT7) and one on VT8. As is commonly known, you can switch between Virtual Terminals with the shortcuts Ctrl + Alt + Fx (where x is the terminal number).

Now the problem is this: By default, VT7 is enabled and VT8 is disabled. But when I switch to VT8, it becomes enabled but VT7 becomes disabled.

How can I make both X Server terminals/servers run in parallel?

Thank you.

Here is my lightdm.conf

[SeatDefaults]

greeter-session=unity-greeter

user-session=ubuntu



[Seat:0]

xserver-layout=default



[Seat:1]

xserver-layout=displaylink

Here are only the relevant parts of my xorg.conf:

# Two Server Layouts



Section "ServerLayout"

    Identifier     "default"

    Screen      0  "Screen0" 0 0

    InputDevice    "Mouse0" "CorePointer"

    InputDevice    "Keyboard0" "CoreKeyboard"

EndSection



Section "ServerLayout"

    Identifier     "displaylink"

    Screen         "DisplayLinkScreen"

    InputDevice    "Mouse1"

EndSection



# Two Screens



Section "Screen"

    Identifier "Screen0"

    Device     "Card0"

    Monitor    "Monitor0"

    SubSection "Display"

        Viewport   0 0

        Depth     24

    EndSubSection

EndSection



Section "Screen"

        Identifier      "DisplayLinkScreen"

        Device          "DisplayLinkDevice"

        Monitor         "DisplayLinkMonitor"

        SubSection "Display"

                Depth   24

                Modes   "800x480"

        EndSubSection

EndSection



# Two Monitors



Section "Monitor"

    Identifier   "Monitor0"

    VendorName   "Monitor Vendor"

    ModelName    "Monitor Model"

EndSection



Section "Monitor"

        Identifier      "DisplayLinkMonitor"

EndSection



# Two Graphics Cards/Interfaces



Section "Device"

    Identifier  "Card0"

    Driver      "nvidia"

    BusID       "PCI:1:0:0"

EndSection



Section "Device"

        Identifier      "DisplayLinkDevice"

        driver          "displaylink"

        Option  "fbdev" "/dev/fb1"

EndSection



# Three Input Devices (the last is touchscreen of the USB monitor)



Section "InputDevice"

    Identifier  "Keyboard0"

    Driver      "kbd"

EndSection



Section "InputDevice"

    Identifier  "Mouse0"

    Driver      "mouse"

    Option      "Protocol" "auto"

    Option      "Device" "/dev/input/mice"

    Option      "ZAxisMapping" "4 5 6 7"

EndSection



Section "InputDevice"

    Identifier     "Mouse1"

    Driver         "mouse"

    Option         "Device"        "/dev/input/by-path/pci-0000:00:1d.7-usb-0:1.3:1.0-event"

EndSection