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ERROR - Black screen in CFX-Pre and CFD-Post
Authored by Erdoğan Gökbulut
November 11th, 2024
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KB2403011
Error
The user experiences a black screen CFX-Pre and CFX-Post when working over Windows remote desktop and or their local computer.
Software & Version
CFX-Pre and CFX-Post 2019R1, 2019R2 & 2023R1
*This example was taken from this version(s) but is not necessarily limited to this version(s).
Description/Cause
There is an issue in CFX-Pre and CFD-Post in Ansys 2019 R1 and 2019 R2 when connecting a PC or Virtual Machine remotely with Windows Remote Desktop. Note: there have been no reported similar issues for any earlier releases. Related Ansys KB Article - https://support.ansys.com/AnsysCustomerPortal/en_us/Knowledge+Resources/Solutions/CFX/2061743
This issue has also been observed occurring on a local computer as well as via an RDP session.
Solution
There are two potential solutions to this problem. The first is the easiest to implement.
Solution #1 - Update GPU Drivers
- Update Nvidia GPU drivers directly on the machine Ansys is installed on, directly from Nvidia website to ensure you have the latest version.
Download The Official NVIDIA Drivers | NVIDIA
Note: To identify what GPU you have, open the Nvidia Control panel and click System Information in the lower left.
Solution #2 - Environmental Variable
Set the following system environment variable on the computer you are remoting into. This solution doesn't work in all situations.
QT_OPENGL=desktop Solution #3 - Utilize nVIDIA's OpenGL RDP
Obtain and run "nvidiaopenglrdp.exe" application provided by Nvidia on the computer you are remoting into. You will still use the same Windows RDP client, but this utilize enables OpenGL support over RDP which can improve performance and in this case, solves a problem. You must register in order to download this application.
- Download the application from - https://developer.nvidia.com/nvidia-opengl-rdp
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