[GH-ISSUE #1647] [Bug]: AssertionError: Torch not compiled with CUDA enabled #487

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opened 2026-10-31 22:13:37 +00:00 by bsakaguchi · 6 comments

bsakaguchi commented 2026-10-31 22:13:37 +00:00

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Originally created by @1LucasGraham on GitHub (Mar 11, 2026).
Original GitHub issue: https://github.com/Comfy-Org/desktop/issues/1647

App Version

v0.8.18

Expected Behavior

How to solve the problem of installing and starting ComfyUI desktop version for the first time?

Actual Behavior

How to solve the problem of installing and starting ComfyUI desktop version for the first time?

Steps to Reproduce

How to solve the problem of installing and starting ComfyUI desktop version for the first time?

Debug Logs

[2026-03-11 14:41:38.212] [info]  Adding extra search path custom_nodes C:\Users\lucas\Documents\ComfyUI\custom_nodes
Adding extra search path download_model_base C:\Users\lucas\Documents\ComfyUI\models
Adding extra search path custom_nodes C:\ComfyUI\resources\ComfyUI\custom_nodes

[2026-03-11 14:41:38.213] [info]  Setting output directory to: C:\Users\lucas\Documents\ComfyUI\output
Setting input directory to: C:\Users\lucas\Documents\ComfyUI\input
Setting user directory to: C:\Users\lucas\Documents\ComfyUI\user

[2026-03-11 14:41:38.619] [error] C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\requests\__init__.py:113: RequestsDependencyWarning: urllib3 (2.6.3) or chardet (7.0.1)/charset_normalizer (3.4.5) doesn't match a supported version!
  warnings.warn(

[2026-03-11 14:41:41.014] [info]  [START] Security scan
[DONE] Security scan
** ComfyUI startup time: 2026-03-11 14:41:41.014
** Platform:
[2026-03-11 14:41:41.015] [info]   Windows
** Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
** Python executable: C:\Users\lucas\Documents\ComfyUI\.venv\Scripts\python.exe
** ComfyUI Path: C:\ComfyUI\resources\ComfyUI
** ComfyUI Base Folder Path: C:\ComfyUI\resources\ComfyUI
** User directory: C:\Users\lucas\Documents\ComfyUI\user
** ComfyUI-Manager config path: C:\Users\lucas\Documents\ComfyUI\user\__manager\config.ini
** Log path: C:\Users\lucas\Documents\ComfyUI\user\comfyui.log

[2026-03-11 14:41:41.879] [info]  [ComfyUI-Manager] Skipped fixing the 'comfyui-frontend-package' dependency because the ComfyUI is outdated.

[2026-03-11 14:41:41.880] [info]  [PRE] ComfyUI-Manager

[2026-03-11 14:41:56.789] [info]  Found comfy_kitchen backend eager: {'available': True, 'disabled': False, 'unavailable_reason': None, 'capabilities': ['apply_rope', 'apply_rope1', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'scaled_mm_nvfp4']}
Found comfy_kitchen backend cuda: {'available': False, 'disabled': True, 'unavailable_reason': 'CUDA not available on this system', 'capabilities': []}

[2026-03-11 14:41:56.790] [info]  Found comfy_kitchen backend triton: {'available': False, 'disabled': True, 'unavailable_reason': "ImportError: No module named 'triton'", 'capabilities': []}

[2026-03-11 14:41:56.847] [info]  Checkpoint files will always be loaded safely.

[2026-03-11 14:41:56.927] [error] Traceback (most recent call last):
  File "C:\ComfyUI\resources\ComfyUI\main.py", line 183, in <module>

[2026-03-11 14:41:56.928] [error]     import execution
  File "C:\ComfyUI\resources\ComfyUI\execution.py", line 17, in <module>
    import comfy.model_management
  File "C:\ComfyUI\resources\ComfyUI\comfy\model_management.py", line 256, in <module>

[2026-03-11 14:41:56.929] [error]     total_vram = get_total_memory(get_torch_device()) / (1024 * 1024)
              
[2026-03-11 14:41:56.930] [error]                   
[2026-03-11 14:41:56.930] [error]   ^^^^^^^^^^^^^^^
[2026-03-11 14:41:56.931] [error] ^^^
  File "C:\ComfyUI\resources\ComfyUI\comfy\model_management.py", line 206, in get_torch_device
    return torch.device(torch.cuda.current_device())

[2026-03-11 14:41:56.931] [error]                 
[2026-03-11 14:41:56.932] [error]         ^^^^^^^^^^^
[2026-03-11 14:41:56.933] [error] ^^^^^^^^^^^^^^^^
  File "C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\torch\cuda\__init__.py", line 1094, in current_device

[2026-03-11 14:41:56.935] [error]     _lazy_init()
  File "C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\torch\cuda\__init__.py", line 417, in _lazy_init
    raise AssertionError("Torch not compiled with CUDA enabled")
AssertionError: Torch not compiled with CUDA enabled[2026-03-11 14:41:38.212] [info]  Adding extra search path custom_nodes C:\Users\lucas\Documents\ComfyUI\custom_nodes
Adding extra search path download_model_base C:\Users\lucas\Documents\ComfyUI\models
Adding extra search path custom_nodes C:\ComfyUI\resources\ComfyUI\custom_nodes

[2026-03-11 14:41:38.213] [info]  Setting output directory to: C:\Users\lucas\Documents\ComfyUI\output
Setting input directory to: C:\Users\lucas\Documents\ComfyUI\input
Setting user directory to: C:\Users\lucas\Documents\ComfyUI\user

[2026-03-11 14:41:38.619] [error] C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\requests\__init__.py:113: RequestsDependencyWarning: urllib3 (2.6.3) or chardet (7.0.1)/charset_normalizer (3.4.5) doesn't match a supported version!
  warnings.warn(

[2026-03-11 14:41:41.014] [info]  [START] Security scan
[DONE] Security scan
** ComfyUI startup time: 2026-03-11 14:41:41.014
** Platform:
[2026-03-11 14:41:41.015] [info]   Windows
** Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)]
** Python executable: C:\Users\lucas\Documents\ComfyUI\.venv\Scripts\python.exe
** ComfyUI Path: C:\ComfyUI\resources\ComfyUI
** ComfyUI Base Folder Path: C:\ComfyUI\resources\ComfyUI
** User directory: C:\Users\lucas\Documents\ComfyUI\user
** ComfyUI-Manager config path: C:\Users\lucas\Documents\ComfyUI\user\__manager\config.ini
** Log path: C:\Users\lucas\Documents\ComfyUI\user\comfyui.log

[2026-03-11 14:41:41.879] [info]  [ComfyUI-Manager] Skipped fixing the 'comfyui-frontend-package' dependency because the ComfyUI is outdated.

[2026-03-11 14:41:41.880] [info]  [PRE] ComfyUI-Manager

[2026-03-11 14:41:56.789] [info]  Found comfy_kitchen backend eager: {'available': True, 'disabled': False, 'unavailable_reason': None, 'capabilities': ['apply_rope', 'apply_rope1', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'scaled_mm_nvfp4']}
Found comfy_kitchen backend cuda: {'available': False, 'disabled': True, 'unavailable_reason': 'CUDA not available on this system', 'capabilities': []}

[2026-03-11 14:41:56.790] [info]  Found comfy_kitchen backend triton: {'available': False, 'disabled': True, 'unavailable_reason': "ImportError: No module named 'triton'", 'capabilities': []}

[2026-03-11 14:41:56.847] [info]  Checkpoint files will always be loaded safely.

[2026-03-11 14:41:56.927] [error] Traceback (most recent call last):
  File "C:\ComfyUI\resources\ComfyUI\main.py", line 183, in <module>

[2026-03-11 14:41:56.928] [error]     import execution
  File "C:\ComfyUI\resources\ComfyUI\execution.py", line 17, in <module>
    import comfy.model_management
  File "C:\ComfyUI\resources\ComfyUI\comfy\model_management.py", line 256, in <module>

[2026-03-11 14:41:56.929] [error]     total_vram = get_total_memory(get_torch_device()) / (1024 * 1024)
              
[2026-03-11 14:41:56.930] [error]                   
[2026-03-11 14:41:56.930] [error]   ^^^^^^^^^^^^^^^
[2026-03-11 14:41:56.931] [error] ^^^
  File "C:\ComfyUI\resources\ComfyUI\comfy\model_management.py", line 206, in get_torch_device
    return torch.device(torch.cuda.current_device())

[2026-03-11 14:41:56.931] [error]                 
[2026-03-11 14:41:56.932] [error]         ^^^^^^^^^^^
[2026-03-11 14:41:56.933] [error] ^^^^^^^^^^^^^^^^
  File "C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\torch\cuda\__init__.py", line 1094, in current_device

[2026-03-11 14:41:56.935] [error]     _lazy_init()
  File "C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\torch\cuda\__init__.py", line 417, in _lazy_init
    raise AssertionError("Torch not compiled with CUDA enabled")
AssertionError: Torch not compiled with CUDA enabled

Browser Logs

No response

Settings JSON

No response

Other

┆Issue is synchronized with this Notion page by Unito

Originally created by @1LucasGraham on GitHub (Mar 11, 2026). Original GitHub issue: https://github.com/Comfy-Org/desktop/issues/1647 ### App Version v0.8.18 ### Expected Behavior How to solve the problem of installing and starting ComfyUI desktop version for the first time? ### Actual Behavior How to solve the problem of installing and starting ComfyUI desktop version for the first time? ### Steps to Reproduce How to solve the problem of installing and starting ComfyUI desktop version for the first time? ### Debug Logs ```powershell [2026-03-11 14:41:38.212] [info] Adding extra search path custom_nodes C:\Users\lucas\Documents\ComfyUI\custom_nodes Adding extra search path download_model_base C:\Users\lucas\Documents\ComfyUI\models Adding extra search path custom_nodes C:\ComfyUI\resources\ComfyUI\custom_nodes [2026-03-11 14:41:38.213] [info] Setting output directory to: C:\Users\lucas\Documents\ComfyUI\output Setting input directory to: C:\Users\lucas\Documents\ComfyUI\input Setting user directory to: C:\Users\lucas\Documents\ComfyUI\user [2026-03-11 14:41:38.619] [error] C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\requests\__init__.py:113: RequestsDependencyWarning: urllib3 (2.6.3) or chardet (7.0.1)/charset_normalizer (3.4.5) doesn't match a supported version! warnings.warn( [2026-03-11 14:41:41.014] [info] [START] Security scan [DONE] Security scan ** ComfyUI startup time: 2026-03-11 14:41:41.014 ** Platform: [2026-03-11 14:41:41.015] [info] Windows ** Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)] ** Python executable: C:\Users\lucas\Documents\ComfyUI\.venv\Scripts\python.exe ** ComfyUI Path: C:\ComfyUI\resources\ComfyUI ** ComfyUI Base Folder Path: C:\ComfyUI\resources\ComfyUI ** User directory: C:\Users\lucas\Documents\ComfyUI\user ** ComfyUI-Manager config path: C:\Users\lucas\Documents\ComfyUI\user\__manager\config.ini ** Log path: C:\Users\lucas\Documents\ComfyUI\user\comfyui.log [2026-03-11 14:41:41.879] [info] [ComfyUI-Manager] Skipped fixing the 'comfyui-frontend-package' dependency because the ComfyUI is outdated. [2026-03-11 14:41:41.880] [info] [PRE] ComfyUI-Manager [2026-03-11 14:41:56.789] [info] Found comfy_kitchen backend eager: {'available': True, 'disabled': False, 'unavailable_reason': None, 'capabilities': ['apply_rope', 'apply_rope1', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'scaled_mm_nvfp4']} Found comfy_kitchen backend cuda: {'available': False, 'disabled': True, 'unavailable_reason': 'CUDA not available on this system', 'capabilities': []} [2026-03-11 14:41:56.790] [info] Found comfy_kitchen backend triton: {'available': False, 'disabled': True, 'unavailable_reason': "ImportError: No module named 'triton'", 'capabilities': []} [2026-03-11 14:41:56.847] [info] Checkpoint files will always be loaded safely. [2026-03-11 14:41:56.927] [error] Traceback (most recent call last): File "C:\ComfyUI\resources\ComfyUI\main.py", line 183, in <module> [2026-03-11 14:41:56.928] [error] import execution File "C:\ComfyUI\resources\ComfyUI\execution.py", line 17, in <module> import comfy.model_management File "C:\ComfyUI\resources\ComfyUI\comfy\model_management.py", line 256, in <module> [2026-03-11 14:41:56.929] [error] total_vram = get_total_memory(get_torch_device()) / (1024 * 1024) [2026-03-11 14:41:56.930] [error] [2026-03-11 14:41:56.930] [error] ^^^^^^^^^^^^^^^ [2026-03-11 14:41:56.931] [error] ^^^ File "C:\ComfyUI\resources\ComfyUI\comfy\model_management.py", line 206, in get_torch_device return torch.device(torch.cuda.current_device()) [2026-03-11 14:41:56.931] [error] [2026-03-11 14:41:56.932] [error] ^^^^^^^^^^^ [2026-03-11 14:41:56.933] [error] ^^^^^^^^^^^^^^^^ File "C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\torch\cuda\__init__.py", line 1094, in current_device [2026-03-11 14:41:56.935] [error] _lazy_init() File "C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\torch\cuda\__init__.py", line 417, in _lazy_init raise AssertionError("Torch not compiled with CUDA enabled") AssertionError: Torch not compiled with CUDA enabled[2026-03-11 14:41:38.212] [info] Adding extra search path custom_nodes C:\Users\lucas\Documents\ComfyUI\custom_nodes Adding extra search path download_model_base C:\Users\lucas\Documents\ComfyUI\models Adding extra search path custom_nodes C:\ComfyUI\resources\ComfyUI\custom_nodes [2026-03-11 14:41:38.213] [info] Setting output directory to: C:\Users\lucas\Documents\ComfyUI\output Setting input directory to: C:\Users\lucas\Documents\ComfyUI\input Setting user directory to: C:\Users\lucas\Documents\ComfyUI\user [2026-03-11 14:41:38.619] [error] C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\requests\__init__.py:113: RequestsDependencyWarning: urllib3 (2.6.3) or chardet (7.0.1)/charset_normalizer (3.4.5) doesn't match a supported version! warnings.warn( [2026-03-11 14:41:41.014] [info] [START] Security scan [DONE] Security scan ** ComfyUI startup time: 2026-03-11 14:41:41.014 ** Platform: [2026-03-11 14:41:41.015] [info] Windows ** Python version: 3.12.11 (main, Aug 18 2025, 19:17:54) [MSC v.1944 64 bit (AMD64)] ** Python executable: C:\Users\lucas\Documents\ComfyUI\.venv\Scripts\python.exe ** ComfyUI Path: C:\ComfyUI\resources\ComfyUI ** ComfyUI Base Folder Path: C:\ComfyUI\resources\ComfyUI ** User directory: C:\Users\lucas\Documents\ComfyUI\user ** ComfyUI-Manager config path: C:\Users\lucas\Documents\ComfyUI\user\__manager\config.ini ** Log path: C:\Users\lucas\Documents\ComfyUI\user\comfyui.log [2026-03-11 14:41:41.879] [info] [ComfyUI-Manager] Skipped fixing the 'comfyui-frontend-package' dependency because the ComfyUI is outdated. [2026-03-11 14:41:41.880] [info] [PRE] ComfyUI-Manager [2026-03-11 14:41:56.789] [info] Found comfy_kitchen backend eager: {'available': True, 'disabled': False, 'unavailable_reason': None, 'capabilities': ['apply_rope', 'apply_rope1', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'scaled_mm_nvfp4']} Found comfy_kitchen backend cuda: {'available': False, 'disabled': True, 'unavailable_reason': 'CUDA not available on this system', 'capabilities': []} [2026-03-11 14:41:56.790] [info] Found comfy_kitchen backend triton: {'available': False, 'disabled': True, 'unavailable_reason': "ImportError: No module named 'triton'", 'capabilities': []} [2026-03-11 14:41:56.847] [info] Checkpoint files will always be loaded safely. [2026-03-11 14:41:56.927] [error] Traceback (most recent call last): File "C:\ComfyUI\resources\ComfyUI\main.py", line 183, in <module> [2026-03-11 14:41:56.928] [error] import execution File "C:\ComfyUI\resources\ComfyUI\execution.py", line 17, in <module> import comfy.model_management File "C:\ComfyUI\resources\ComfyUI\comfy\model_management.py", line 256, in <module> [2026-03-11 14:41:56.929] [error] total_vram = get_total_memory(get_torch_device()) / (1024 * 1024) [2026-03-11 14:41:56.930] [error] [2026-03-11 14:41:56.930] [error] ^^^^^^^^^^^^^^^ [2026-03-11 14:41:56.931] [error] ^^^ File "C:\ComfyUI\resources\ComfyUI\comfy\model_management.py", line 206, in get_torch_device return torch.device(torch.cuda.current_device()) [2026-03-11 14:41:56.931] [error] [2026-03-11 14:41:56.932] [error] ^^^^^^^^^^^ [2026-03-11 14:41:56.933] [error] ^^^^^^^^^^^^^^^^ File "C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\torch\cuda\__init__.py", line 1094, in current_device [2026-03-11 14:41:56.935] [error] _lazy_init() File "C:\Users\lucas\Documents\ComfyUI\.venv\Lib\site-packages\torch\cuda\__init__.py", line 417, in _lazy_init raise AssertionError("Torch not compiled with CUDA enabled") AssertionError: Torch not compiled with CUDA enabled ``` ### Browser Logs _No response_ ### Settings JSON _No response_ ### Other <img width="844" height="872" alt="Image" src="https://github.com/user-attachments/assets/f78f9341-f594-4cdf-bc5f-f169b2dde219" /> ┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-1647-Bug-AssertionError-Torch-not-compiled-with-CUDA-enabled-3206d73d3650811d8018c33340993d1b) by [Unito](https://www.unito.io)

bsakaguchi 2026-10-31 22:13:37 +00:00

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bsakaguchi commented 2026-10-31 22:13:38 +00:00

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@dosubot[bot] commented on GitHub (Mar 11, 2026):

Hi @1LucasGraham! I'm Dosu and I’m helping the desktop team.

This error occurs when PyTorch was installed without CUDA support, even though your RTX 4070 and drivers are working correctly.

Quick fix: Open the ComfyUI virtual environment and reinstall PyTorch with CUDA support:

cd C:\Users\lucas\Documents\ComfyUI\.venv\Scripts
activate
uv pip uninstall torch torchvision torchaudio
uv pip install torch torchvision torchaudio --index-url=https://download.pytorch.org/whl/cu128

You can verify the fix worked by running:

python -c "import torch; print(torch.cuda.is_available())"

This should return True.

If this doesn't work, a VPN can sometimes block PyTorch downloads during installation. If you were using a VPN when you first installed ComfyUI Desktop, try:

1. Completely uninstall ComfyUI Desktop (including deleting %APPDATA%\ComfyUI)
2. Disconnect your VPN
3. Reinstall ComfyUI Desktop
4. Reconnect VPN after installation completes

This is a known issue that happens when the CUDA-enabled PyTorch fails to download properly during initial setup.

To reply, just mention @dosu.

---

Share context across your team and agents. Try Dosu.

<!-- gh-comment-id:4036948783 --> @dosubot[bot] commented on GitHub (Mar 11, 2026): <!-- Greeting --> Hi @1LucasGraham! I'm [Dosu](https://go.dosu.dev/dosubot) and I’m helping the desktop team. <!-- Answer --> This error occurs when PyTorch was installed without CUDA support, even though your RTX 4070 and drivers are working correctly. **Quick fix:** Open the ComfyUI virtual environment and reinstall PyTorch with CUDA support: ```bash cd C:\Users\lucas\Documents\ComfyUI\.venv\Scripts activate uv pip uninstall torch torchvision torchaudio uv pip install torch torchvision torchaudio --index-url=https://download.pytorch.org/whl/cu128 ``` You can verify the fix worked by running: ```bash python -c "import torch; print(torch.cuda.is_available())" ``` This should return `True`. **If this doesn't work**, [a VPN can sometimes block PyTorch downloads during installation](https://github.com/Comfy-Org/desktop/issues/1346). If you were using a VPN when you first installed ComfyUI Desktop, try: 1. Completely uninstall ComfyUI Desktop (including deleting `%APPDATA%\ComfyUI`) 2. Disconnect your VPN 3. Reinstall ComfyUI Desktop 4. Reconnect VPN after installation completes This is a [known issue](https://github.com/Comfy-Org/desktop/issues/1477) that happens when the CUDA-enabled PyTorch fails to download properly during initial setup. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=Comfy-Org%2Fdesktop).* --- Share context across your team and agents. Try [Dosu](https://dosu.dev?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-tagline&utm_term=Comfy-Org%2Fdesktop). [](https://app.dosu.dev/response-feedback?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-feedback&utm_term=Comfy-Org%2Fdesktop#message_id=dc9108c0-5acd-403f-828a-311ca93ff7a2) [](https://github.dosu.com/Comfy-Org/desktop?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-learn-repo&utm_term=Comfy-Org%2Fdesktop) [](https://app.dosu.dev/signup?referrer=openSource&source=github-footer&utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-add-team&utm_term=Comfy-Org%2Fdesktop)

bsakaguchi commented 2026-10-31 22:13:38 +00:00

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@1LucasGraham commented on GitHub (Mar 11, 2026):

Hi @1LucasGraham! I'm Dosu and I’m helping the desktop team.

This error occurs when PyTorch was installed without CUDA support, even though your RTX 4070 and drivers are working correctly.

Quick fix: Open the ComfyUI virtual environment and reinstall PyTorch with CUDA support:

cd C:\Users\lucas\Documents\ComfyUI.venv\Scripts
activate
uv pip uninstall torch torchvision torchaudio
uv pip install torch torchvision torchaudio --index-url=https://download.pytorch.org/whl/cu128
You can verify the fix worked by running:

python -c "import torch; print(torch.cuda.is_available())"
This should return .True

If this doesn't work, a VPN can sometimes block PyTorch downloads during installation. If you were using a VPN when you first installed ComfyUI Desktop, try:

1. Completely uninstall ComfyUI Desktop (including deleting %APPDATA%\ComfyUI)
2. Disconnect your VPN
3. Reinstall ComfyUI Desktop
4. Reconnect VPN after installation completes

This is a known issue that happens when the CUDA-enabled PyTorch fails to download properly during initial setup.

To reply, just mention @dosu.

How did I do? Good | Irrelevant | Incorrect | Verbose | Hallucination | Report 🐛 | Other

   

Thanks, trying to reinstall it.

<!-- gh-comment-id:4037002133 --> @1LucasGraham commented on GitHub (Mar 11, 2026): > Hi [@1LucasGraham](https://github.com/1LucasGraham)! I'm [Dosu](https://go.dosu.dev/dosubot) and I’m helping the desktop team. > > This error occurs when PyTorch was installed without CUDA support, even though your RTX 4070 and drivers are working correctly. > > **Quick fix:** Open the ComfyUI virtual environment and reinstall PyTorch with CUDA support: > > cd C:\Users\lucas\Documents\ComfyUI\.venv\Scripts > activate > uv pip uninstall torch torchvision torchaudio > uv pip install torch torchvision torchaudio --index-url=https://download.pytorch.org/whl/cu128 > You can verify the fix worked by running: > > python -c "import torch; print(torch.cuda.is_available())" > This should return .`True` > > **If this doesn't work**, [a VPN can sometimes block PyTorch downloads during installation](https://github.com/Comfy-Org/desktop/issues/1346). If you were using a VPN when you first installed ComfyUI Desktop, try: > > 1. Completely uninstall ComfyUI Desktop (including deleting `%APPDATA%\ComfyUI`) > 2. Disconnect your VPN > 3. Reinstall ComfyUI Desktop > 4. Reconnect VPN after installation completes > > This is a [known issue](https://github.com/Comfy-Org/desktop/issues/1477) that happens when the CUDA-enabled PyTorch fails to download properly during initial setup. > > _To reply, just mention [@dosu](https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-assistant&utm_content=brand-link)._ > > How did I do? 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bsakaguchi commented 2026-10-31 22:13:38 +00:00

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@1LucasGraham commented on GitHub (Mar 11, 2026):

Run

python -c "import torch; print(torch.cuda.is_available())"

Result

False

@dosu

<!-- gh-comment-id:4037244361 --> @1LucasGraham commented on GitHub (Mar 11, 2026): Run `python -c "import torch; print(torch.cuda.is_available())"` Result `False` @dosu

bsakaguchi commented 2026-10-31 22:13:38 +00:00

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@dosubot[bot] commented on GitHub (Mar 11, 2026):

Let's verify the installation actually has CUDA support. Can you run these commands and share the output?

pip show torch
python -c "import torch; print(torch.__version__)"
python -c "import torch; print(torch.version.cuda)"

The torch.__version__ should show something like 2.x.x+cu128 - the +cu128 suffix indicates CUDA support. If it shows just 2.x.x without the +cu suffix, it installed the CPU-only version.

Also, I noticed you used pip uninstall instead of uv pip uninstall in your screenshot. Since ComfyUI Desktop uses uv for package management, try using uv consistently:

uv pip uninstall torch torchvision torchaudio
uv pip install torch torchvision torchaudio --index-url=https://download.pytorch.org/whl/cu128

If it still doesn't work, your RTX 4070 with driver 595.71 should support CUDA 13.0. You could try the newer CUDA build:

uv pip uninstall torch torchvision torchaudio
uv pip install torch torchvision torchaudio --index-url=https://download.pytorch.org/whl/cu130

To reply, just mention @dosu.

---

Docs are dead. Just use Dosu.

<!-- gh-comment-id:4037254893 --> @dosubot[bot] commented on GitHub (Mar 11, 2026): <!-- Answer --> Let's verify the installation actually has CUDA support. Can you run these commands and share the output? ```bash pip show torch python -c "import torch; print(torch.__version__)" python -c "import torch; print(torch.version.cuda)" ``` The `torch.__version__` should show something like `2.x.x+cu128` - the `+cu128` suffix indicates CUDA support. If it shows just `2.x.x` without the `+cu` suffix, it installed the CPU-only version. Also, I noticed you used `pip uninstall` instead of `uv pip uninstall` in your screenshot. Since ComfyUI Desktop uses `uv` for package management, try using `uv` consistently: ```bash uv pip uninstall torch torchvision torchaudio uv pip install torch torchvision torchaudio --index-url=https://download.pytorch.org/whl/cu128 ``` If it still doesn't work, your RTX 4070 with driver 595.71 should support CUDA 13.0. You could try the newer CUDA build: ```bash uv pip uninstall torch torchvision torchaudio uv pip install torch torchvision torchaudio --index-url=https://download.pytorch.org/whl/cu130 ``` <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=Comfy-Org%2Fdesktop).* --- Docs are dead. Just use [Dosu](https://dosu.dev?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=static-docs-tagline&utm_term=Comfy-Org%2Fdesktop). [](https://app.dosu.dev/response-feedback?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=static-docs-feedback&utm_term=Comfy-Org%2Fdesktop#message_id=3a4cf4d1-4f43-4350-8857-2eaff003b721) [](https://github.dosu.com/Comfy-Org/desktop?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=static-docs-ask-repo&utm_term=Comfy-Org%2Fdesktop) [](https://app.dosu.dev/signup?referrer=openSource&source=github-footer&utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=static-docs-share-team&utm_term=Comfy-Org%2Fdesktop)

bsakaguchi commented 2026-10-31 22:13:38 +00:00

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@1LucasGraham commented on GitHub (Mar 11, 2026):

Abandon the desktop version.

Manual installation successful.

Tip: Pytorch download always times out.

@dosu

<!-- gh-comment-id:4037595785 --> @1LucasGraham commented on GitHub (Mar 11, 2026): Abandon the desktop version. Manual installation successful. Tip: Pytorch download always times out. @dosu

bsakaguchi commented 2026-10-31 22:13:38 +00:00

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@dosubot[bot] commented on GitHub (Mar 11, 2026):

Glad you got ComfyUI working with the manual installation!

The PyTorch download timeout issue is a known problem, often caused by network conditions or VPN interference during the desktop app's setup. The PyTorch packages are quite large (~2GB), so slower or unstable connections can fail before completing.

Thanks for reporting this - it helps the team understand the installation pain points. If you ever want to try the desktop version again, disabling VPN and ensuring a stable network connection during initial setup usually helps.

To reply, just mention @dosu.

---

Share context across your team and agents. Try Dosu.

<!-- gh-comment-id:4037597598 --> @dosubot[bot] commented on GitHub (Mar 11, 2026): <!-- Answer --> Glad you got ComfyUI working with the manual installation! The PyTorch download timeout issue is a [known problem](https://github.com/Comfy-Org/desktop/issues/1346), often caused by network conditions or VPN interference during the desktop app's setup. The PyTorch packages are quite large (~2GB), so slower or unstable connections can fail before completing. Thanks for reporting this - it helps the team understand the installation pain points. If you ever want to try the desktop version again, disabling VPN and ensuring a stable network connection during initial setup usually helps. <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=Comfy-Org%2Fdesktop).* --- Share context across your team and agents. Try [Dosu](https://dosu.dev?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-tagline&utm_term=Comfy-Org%2Fdesktop). [](https://app.dosu.dev/response-feedback?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-feedback&utm_term=Comfy-Org%2Fdesktop#message_id=0ce63c44-2ee4-4d2c-ab4d-3c38b9bab706) [](https://github.dosu.com/Comfy-Org/desktop?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-learn-repo&utm_term=Comfy-Org%2Fdesktop) [](https://app.dosu.dev/signup?referrer=openSource&source=github-footer&utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=knowledge-infrastructure-add-team&utm_term=Comfy-Org%2Fdesktop)

bsakaguchi referenced this issue 2026-10-31 22:17:55 +00:00

[PR #487] [MERGED] Fix log files not rotated #904

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