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This is a problem for me also. I have AutoCAD 2016 and 2017 installed and hardware acceleration is only working for AutoCAD 2016.
For AutoCAD 2017 the tuner log looks like this:
Card name: NVIDIA Quadro 4000M
Driver version: 10.18.13.6839
Tuning Date: 4/07/2016
Virtual device: gdi13.hdi (Software)
The card and driver does not meet the minimum requirement.
while 2016 says:
Card name: NVIDIA Quadro 4000M
Driver version: 10.18.13.6839
Tuning Date: 5/07/2016
Virtual device: Dx11 (Hardware)
The card and driver meets the recommended requirement.
It would be great to be able to resolve this problem without reinstalling AutoCAD. I tried copying the 2016 CertificationDB.xml into the 2017 folder to no avail. Deleting the file had no effect.
Is there any way to force the graphics tuning process? I have tried resetting AutoCAD to its defaults, uninstalling all video drivers and editing the registry as recommended.