Display issues when connecting to VNC Server running on Windows 10

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In some circumstances, your Windows 10 (1803 or later) remote computer will not display correctly in VNC Viewer . The commonly reported issues are:

  • a black or blank screen
  • application windows are white
  • the Start Menu is smaller than expected

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.

It appears that in the above situations, Windows does not correctly report graphical updates to be captured by VNC Server using DirectX. At this time, there are 2 known workarounds:

  1. Upgrade VNC Server to version 6.5.0, as this version contains some changes to try and automatically recover from a blank screen
  2. Connect an EDID emulator to the VNC Server computer. An example EDID emulator can be seen here
    Note: RealVNC have not tested this particular emulator and it is only provided as an example
  3. Change the VNC Server CaptureMethod parameter:
    • On the remote Windows computer, open the VNC Server dialog.
    • Select Options from the hamburger menu.
    • On the Expert tab, filter the list for CaptureMethod, and set the value to 1
    • Restart VNC Server

      This can also be specified using the Registry, in the HKLM\Software\RealVNC\vncserver key. Create a String value named CaptureMethod and set a value of 1.
      Note: If you have an Enterprise subscription, you can configure computers remotely or in bulk using Group Policy.

 

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