# Can't use Legacy Debugger after updating to CUDA 11.5, Nsight 2021.3

**URL:** <https://forums.developer.nvidia.com/t/cant-use-legacy-debugger-after-updating-to-cuda-11-5-nsight-2021-3/193511>\
**Category:** Nsight Visual Studio Edition\
**Created:** [October 29, 2021, 8:23pm UTC](https://forums.developer.nvidia.com/t/cant-use-legacy-debugger-after-updating-to-cuda-11-5-nsight-2021-3/193511 "2021-10-29T20:23:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![neverhood311](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@neverhood311](https://forums.developer.nvidia.com/u/neverhood311)\
**Post date:** [October 29, 2021, 8:23pm UTC](https://forums.developer.nvidia.com/t/cant-use-legacy-debugger-after-updating-to-cuda-11-5-nsight-2021-3/193511/1 "2021-10-29T20:23:27Z")

</div>

Here are the details for my laptop:  
Windows 10 Home  
GeForce GTX 970M

And I have the following installed:  
CUDA 11.5  
Nsight 2021.3  
Visual Studio 16.11.5

When I was using CUDA 11.3 and Visual Studio 16.9.6, I was able to use the Legacy CUDA Debugger and it worked fine. Now that I’ve updated, whenever I try to debug, I get the following error from Nsight:

```auto
A CUDA context was created on a GPU that is not supported by the legacy CUDA debugger. Breakpoints will be disabled. See output window for details.

Adapter: NVIDIA GeForce GTX 970M
Please see: https://developer.nvidia.com/nsight-visual-studio-edition-supported-gpus-full-list#SupportedComputeConfigs 

```

I navigated to the link the error message provided and found the following:

 ![nsight_device_compatibility](https://global.discourse-cdn.com/nvidia/original/3X/1/c/1c99ed36da06c20268d5fd869068e15d5068c50f.png)

This chart suggests that my card (Maxwell architecture) should still be supported by the Legacy debugger.

Why can I no longer debug after the update?