These are "Heidi Device Interface" drivers that act as a bridge between AutoCAD’s software and your computer's display hardware.
To get your CAD workstation back to peak speed, follow these troubleshooting steps in order: 1. Enable Hardware Acceleration Manually
If you are using AutoCAD 2023 or newer and your GPU is struggling, forcing a downgrade to DirectX 11 often fixes the gdi16.hdi error. autocad virtual device gdi16.hdi
Outdated or incompatible graphics drivers may prevent AutoCAD from recognizing your GPU.
If it switches back to DirectX 11 or 12, the problem is solved. 2. Switch to a Previous DirectX Version These are "Heidi Device Interface" drivers that act
If the option isn't grayed out, you can often fix this in seconds:
Damage to the Windows Management Instrumentation (WMI) can prevent AutoCAD from "seeing" your hardware. How to Fix gdi16.hdi and Restore Performance Switch to a Previous DirectX Version If the
Several factors can force AutoCAD into this "Safe Mode" or software rendering state: