Add Fake Display When No Monitor Is Plugged in in Ubuntu?

14.04display-resolutionheadlessnxremote desktop

I have an Ubuntu 14.04 server that has no external monitor connected. I use NoMachine to remote control the machine. When I do so, the Unity/Gnome interface doesn’t see any monitors connected, so I can only use 800×600 when connecting with NoMachine. If I plug in a monitor, I can set the resolution to whatever size the NoMachine window is on the remote computer.

Is there a way to create a “fake” monitor device on Ubuntu so I can set a desktop resolution in Unity/Gnome?

Accepted Answer

Found a way to do it without requiring a dummy plug: Ubuntu Headless VNC VESA 800×600 Resolution Fix ~ Andy Hawkins @ June 12, 2011

Basically install a dummy driver:

sudo apt-get install xserver-xorg-video-dummy

Then write it in the /usr/share/X11/xorg.conf.d/xorg.conf (or possibly /etc/X11/xorg.conf) file (create one, if it does not exist):

Section "Device"
    Identifier "Configured Video Device"
    Driver "dummy"
EndSection

Section "Monitor"
    Identifier "Configured Monitor"
    HorizSync 31.5-48.5
    VertRefresh 50-70
EndSection

Section "Screen"
    Identifier "Default Screen"
    Monitor "Configured Monitor"
    Device "Configured Video Device"
    DefaultDepth 24
    SubSection "Display"
    Depth 24
    Modes "1024x800"
    EndSubSection
EndSection

Then restart the computer.

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