Два монитора

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Хочу второй монитор по vnc, в качестве монитора — планшет, разрешение планшета 1920x1200, а основного монитора 1920x1080.

Проблема в том, что если я сделаю виртуальный монитор больше основного, — эта область будет залита чёрным.

DM openbox

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 375.66  (buildmeister@swio-display-x86-rhel47-06)  Mon May  1 15:45:32 PDT 2017


Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "U30GT2"  rightof "Screen0"
    Option         "Xinerama" "1"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
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      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection


Section "Device"
    Identifier "Videocard1"
    Driver "dummy"
    VideoRam 256000
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection


Section "Screen"
    Identifier "U30GT2"
    Device "Videocard1"
    Monitor "Monitor0"
    DefaultDepth 24
    SubSection "Display"
       Virtual 1920 1200
       #Virtual 1920 1080
       Modes "1920x1200"
    EndSubSection
EndSection