Hi
I am struggling to get my multi-monitor support working correctly on my rig. I am running KDE Neon Developer with 2 x 34" LG monitors, each capable of 2560 x 1080.
Originally I had a single NVIDIA Quadro 4000 card driving both monitors (DVI + Display Port). The DVI connection runs hapily at full resolution but the Display Port would only achieve 1920 x 1080.
I am using the NVIDIA Drivers.

To try and resolve this I installed a second card (Quadro 600) and run each monitor of the DVI port on each card. The NVIDIA X Server Settings asked me to create a second X Screen when I enabled the second monitor which was written to xorg.conf. Upon rebooting the second monitor seemed to sync at 2560 x 1080 but it appeared to be running a black xServer window with the cross instead of the mouse pointer. I could move my mouse over to this display but couldn't drag any windows onto it.

I installed a whole load of KDE updates and rebooted and the second display now shows the proper desktop with the widgets I had previously added but I still cannot move Windows over to it.
The KDE Display Configuration tool only shows 1 monitor available.
Any suggestions?

Here is my xorg.conf

Code: Select all

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 361.42  (buildd@lgw01-18)  Tue Apr  5 14:33:28 UTC 2016

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 361.42  (buildmeister@swio-display-x64-rhel04-13)  Tue Mar 22 18:37:28 PDT 2016

Section "ServerLayout"

# Removed Option "Xinerama" "0"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" 2560 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "LG Electronics LG ULTRAWIDE"
    HorizSync       30.0 - 90.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "LG Electronics LG ULTRAWIDE"
    HorizSync       30.0 - 90.0
    VertRefresh     56.0 - 75.0
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "Quadro 4000"
    BusID          "PCI:3:0:0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "Quadro 600"
    BusID          "PCI:4:0:0"
EndSection

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

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection


I have the exact same problem. The only difference I have is, I am running arch linux with testing repos enabled and running GTX cards instead of quadro's.
Black screen with cross instead of mouse cursor, nothing can be moved to that screen.