If you want your own driver to work, you will have to research what changes are needed and make your own xorg.To use VNC and RDP with a PC on a different network, you'll need to enable access to the remote computer via its router. Note 2: This method is using the X11 dummy driver, so some graphical features may not be available.
If you need to use a monitor, run sudo mv /etc/X11/nf /etc/X11/ and reboot
Note: Following these steps will result in any connected monitors displaying a blank screen. Reboot the machine, and you should now be able to connect as expected. RHEL / CentOS sudo yum install xorg-x11-drv-dummy. Sudo cp /etc/X11/nf /etc/X11/ # this file may not exist so if there is an error, it can be ignored Sudo apt install xserver-xorg-video-dummy Install the X11 dummy driver, by running:. This can also be specified using a configuration file: /root/.vnc/config.d/vncserver-x11 On the Expert tab, filter the list for CaptureMethod, and set the value to 1. Select Options from the hamburger menu. On the remote Linux computer, open the VNC Server dialog. Change the VNC Server CaptureMethod parameter:. Note: RealVNC have not tested this particular emulator and it is only provided as an example An example EDID emulator can be seen here Connect an EDID emulator to the VNC Server computer. Check that Linux is not set to a "Battery Saver" power mode. Change your Power settings on the Linux computer to never turn off the monitors/displays. If you are running VNC Server on Ubuntu 18.04 LTS or later, or CentOS/RHEL 8 or later, you need to disable Wayland. Upgrade VNC Server to version 6.5.0, as this version contains some changes to try and automatically recover from a blank screen. At this time, there are some known workarounds you can try below: It appears that in the above situations, Linux does not correctly report graphical updates to be captured by VNC Server. The issue is most commonly seen when connecting to a computer with no monitors attached (headless), or a monitor using HDMI/DisplayPort is connected but powered off. 
In some circumstances, your Linux remote computer will not display correctly in VNC Viewer.
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