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[GH-ISSUE #1611] [Bug]: ComfyUI will not start (new install) #482
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Originally created by @ukfliers-coder on GitHub (Feb 19, 2026).
Original GitHub issue: https://github.com/Comfy-Org/desktop/issues/1611
App Version
0.85
Expected Behavior
Server start
Actual Behavior
python process with code 322122547 and signal null
Steps to Reproduce
restarted server
Debug Logs
Browser Logs
Failed to load resource: the server responded with a status of 404 ()
/github-copilot/chat/entitlement:1
Failed to load resource: the server responded with a status of 404 ()
/github-copilot/chat/entitlement:1
Failed to load resource: the server responded with a status of 404 ()
Settings JSON
comfy.settings.json
Other
No response
┆Issue is synchronized with this Notion page by Unito
@dosubot[bot] commented on GitHub (Feb 19, 2026):
Hi @ukfliers-coder! I'm Dosu and I’m helping the desktop team.
The error code
3221225477(hex0xC0000005) is a Windows access violation. This is a known issue with two common causes:1. Outdated NVIDIA Drivers (most likely)
Update your NVIDIA drivers to the latest version. Newer ComfyUI versions require updated GPU drivers to function properly.
2. Installation Path Issues
Your logs show validation passed, so this is less likely, but if updating drivers doesn't help:
C:\Users\robert\Documents\ComfyUIand%APPDATA%\ComfyUIC:\ComfyUI)Start with updating your NVIDIA drivers—that resolves this error in most cases.
To reply, just mention @dosu.
Docs are dead. Just use Dosu.
@ukfliers-coder commented on GitHub (Feb 19, 2026):
Driver is latest (Jan 8, 2026). Deleted as instructed and get the same result. “Unable to start server” and main log shows the error as stated.
Thanks,
From: dosubot[bot] @.>
Sent: Thursday, February 19, 2026 12:58 PM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3928903043
Hi @ukfliers-coder https://github.com/ukfliers-coder ! I'm Dosu https://go.dosu.dev/dosubot and I’m helping the desktop team.
The error code 3221225477 (hex 0xC0000005) is a Windows access violation. This is a known issue https://github.com/Comfy-Org/desktop/issues/1494 with two common causes:
Outdated NVIDIA Drivers (most likely)
Update your NVIDIA drivers to the latest version. Newer ComfyUI versions require updated GPU drivers to function properly.
Installation Path Issues
Your logs show validation passed, so this is less likely, but if updating drivers doesn't help:
Start with updating your NVIDIA drivers—that resolves this error in most cases.
To reply, just mention @dosu https://go.dosu.dev/dosubot .
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@dosubot[bot] commented on GitHub (Feb 19, 2026):
Thanks for trying those steps. Since drivers are current and you've reinstalled cleanly, let's dig deeper:
1. Verify the virtual environment exists
Check if
C:\Users\robert\Documents\ComfyUI\.venvcontains aScripts\python.exefile. If the folder is empty or missing, the Python environment didn't install correctly—possibly due to antivirus interference or network issues during setup.2. Try these additional steps:
%LOCALAPPDATA%\@comfyorgcomfyui-electron-updater%LOCALAPPDATA%\Programs\@comfyorgcomfyui-electronC:\ComfyUI(not Documents or any user folder)3. Check CUDA support
If the .venv exists, open a command prompt in the ComfyUI folder and run:
This should print
True. If it printsFalseor errors, PyTorch may have installed without GPU support.Could you share what GPU you have and whether the .venv folder exists with files in it?
To reply, just mention @dosu.
Docs are dead. Just use Dosu.
@ukfliers-coder commented on GitHub (Feb 19, 2026):
Before I go through these steps I want to point out how scattered folders have appeared.
First of all I deleted as instructed previously and installed to c:\comfyui. This is the result
I have 3 folders on my drive. I have taken screenshots of contents. I never picked the roaming directory when installing . It installed to documents folder and then I chose C:\comfyui as the server install as instructed.
The first screenshot is “root” this is where the virtual environment exists and answer to your first question python.exe is not in there and not anywhere on my machine.
The next screenshot is documents under my user name.
The last folder is directly under Roaming, which I didn’t select at any time
Thanks,
From: dosubot[bot] @.>
Sent: Thursday, February 19, 2026 2:35 PM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3929482498
Thanks for trying those steps. Since drivers are current and you've reinstalled cleanly, let's dig deeper:
Verify the virtual environment exists
Check if C:\Users\robert\Documents\ComfyUI.venv contains a Scripts\python.exe file. If the folder is empty or missing, the Python environment didn't install correctly—possibly due to antivirus interference or network issues during setup https://github.com/Comfy-Org/desktop/issues/1477 .
Try these additional steps:
Temporarily disable Windows Defender/antivirus during installation
Delete these additional folders before reinstalling:
@.***
@.***
Install to a simple path like C:\ComfyUI (not Documents or any user folder)
Run the installer as Administrator
If the .venv exists, open a command prompt in the ComfyUI folder and run:
.venv\Scripts\python.exe -c "import torch; print(torch.cuda.is_available())"
This should print True. If it prints False or errors, PyTorch may have installed without GPU support https://github.com/Comfy-Org/desktop/issues/1495 .
Could you share what GPU you have and whether the .venv folder exists with files in it?
To reply, just mention @dosu https://go.dosu.dev/dosubot .
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@dosubot[bot] commented on GitHub (Feb 19, 2026):
Thanks for the details Robert—this clarifies the issue. The folder structure you're seeing is actually expected behavior:
The critical problem is that
python.exeis missing from the.venv\Scriptsfolder. This means the Python environment failed to download during installation. The app uses a tool calleduvto download Python from GitHub, and if that fails silently, you end up with an empty or incomplete.venv.Likely causes:
To fix this, try a fully clean reinstall:
C:\ComfyUI(or wherever you installed)C:\Users\robert\Documents\ComfyUI%APPDATA%\ComfyUI%LOCALAPPDATA%\@comfyorgcomfyui-electron-updaterC:\ComfyUIWatch the installation progress carefully—if Python download fails, you should see an error. If the issue persists, there may be a network/firewall blocking GitHub access. Could you confirm if you can access GitHub normally from your browser?
To reply, just mention @dosu.
Docs are dead. Just use Dosu.
@ukfliers-coder commented on GitHub (Feb 19, 2026):
Same failure. You can’t see what is installing as the text is behind a dark background installer box. Python is not there again.
I can access github via the browser. My antivirus is Bitdefender and is switched off during installation this time.
I also have Nordvpn running – is that perhaps stopping it from getting to me?
Thanks,
From: dosubot[bot] @.>
Sent: Thursday, February 19, 2026 3:49 PM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3929904842
Thanks for the details Robert—this clarifies the issue. The folder structure you're seeing is actually expected behavior:
The critical problem is that python.exe is missing from the .venv\Scripts folder. This means the Python environment failed to download during installation https://github.com/Comfy-Org/desktop/blob/9bf3ce6cfe73456271362163efe8ea6169cbf03f/src/virtualEnvironment.ts#L374-L383 . The app uses a tool called uv to download Python from GitHub, and if that fails silently, you end up with an empty or incomplete .venv.
Likely causes:
To fix this, try a fully clean reinstall:
Watch the installation progress carefully—if Python download fails, you should see an error. If the issue persists, there may be a network/firewall blocking GitHub access. Could you confirm if you can access GitHub normally from your browser?
To reply, just mention @dosu https://go.dosu.dev/dosubot .
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@dosubot[bot] commented on GitHub (Feb 19, 2026):
Yes, NordVPN is very likely the culprit. VPNs are known to block the Python download that ComfyUI Desktop needs—even when browsing GitHub works normally in a browser. The
uvtool downloads Python binaries from GitHub, and VPN tunnels often interfere with this.Try this:
If you need VPN on during install, try switching NordVPN to split tunneling mode and exclude the ComfyUI installer.
Alternative if VPN can't be disabled:
You can manually set up the Python environment after installation. First, install Python 3.12 from python.org, then in Command Prompt:
Let me know if disconnecting the VPN helps!
To reply, just mention @dosu.
Share context across your team and agents. Try Dosu.
@ukfliers-coder commented on GitHub (Feb 19, 2026):
Disconnecting vpn didn’t change anything (I also had Bitdefender off).
Your manual install of python and updating instructions – I found these issues.
I couldn’t find how to install python or where to put the folder from the tar file.
I did install 3.12 from Microsoft Store…
I changed to C:\comfyUI manuall and ran the second line, third line. Problem with fourth line, it failed and told me to place python.exe in front. It did work then.
The fifth line you tell me to put in “local” when my resources folder is under “roaming”. I did as you said
We are still failing with same error.
Thanks,
From: dosubot[bot] @.>
Sent: Thursday, February 19, 2026 4:34 PM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3930242424
Yes, NordVPN is very likely the culprit. VPNs are known to block the Python download https://github.com/Comfy-Org/desktop/issues/1345 that ComfyUI Desktop needs—even when browsing GitHub works normally in a browser. The uv tool downloads Python binaries from GitHub, and VPN tunnels often interfere with this.
Try this:
If you need VPN on during install, try switching NordVPN to split tunneling mode and exclude the ComfyUI installer.
Alternative if VPN can't be disabled:
You can manually set up the Python environment https://github.com/Comfy-Org/desktop/issues/1477 after installation. First, install Python 3.12 from python.org https://www.python.org/downloads/ , then in Command Prompt:
cd C:\ComfyUI
python -m venv .venv
.venv\Scripts\activate
pip install --upgrade pip
pip install -r "C:\Users\robert\AppData\Local\Programs\ComfyUI\resources\ComfyUI\requirements.txt"
pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu124
Let me know if disconnecting the VPN helps!
To reply, just mention @dosu https://go.dosu.dev/dosubot .
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@dosubot[bot] commented on GitHub (Feb 19, 2026):
Thanks for your patience Robert. A few issues with the manual setup:
1. Microsoft Store Python may cause problems
Microsoft Store Python has been reported to cause issues with ComfyUI. I recommend uninstalling it and installing Python 3.12 from python.org instead (use the "Windows installer (64-bit)" option and check "Add Python to PATH" during install).
2. Correct requirements.txt location
My apologies for the confusion! The correct path is
AppData\Local\Programs, not Roaming:3. Let's redo the manual setup correctly:
First, uninstall Microsoft Store Python, then install from python.org. Then:
Important question: What NVIDIA GPU do you have, and what driver version? The original error (3221225477) often points to driver issues, and since the VPN wasn't the cause, we should verify your GPU drivers are truly up to date.
To reply, just mention @dosu.
Docs are dead. Just use Dosu.
@ukfliers-coder commented on GitHub (Feb 19, 2026):
Didn’t do anything different. It must be my graphics card.
GPU is Radeon RX 6900 XT (AS-Rock) – GDDR6
I bet its too old…
Version – see screencapture of Speccy printout
Thanks,
From: dosubot[bot] @.>
Sent: Thursday, February 19, 2026 5:30 PM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3930512687
Thanks for your patience Robert. A few issues with the manual setup:
Microsoft Store Python may cause problems
Microsoft Store Python has been reported to cause issues with ComfyUI https://github.com/Comfy-Org/desktop/issues/1504 . I recommend uninstalling it and installing Python 3.12 from python.org https://www.python.org/downloads/release/python-3129/ instead (use the "Windows installer (64-bit)" option and check "Add Python to PATH" during install).
Correct requirements.txt location
My apologies for the confusion! The correct path is https://github.com/Comfy-Org/desktop/issues/1346 AppData\Local\Programs, not Roaming:
C:\Users\robert\AppData\Local\Programs\ComfyUI\resources\ComfyUI\requirements.txt
First, uninstall Microsoft Store Python, then install from python.org. Then:
cd C:\ComfyUI
rmdir /s /q .venv
python -m venv .venv
.venv\Scripts\python.exe -m pip install --upgrade pip
.venv\Scripts\pip.exe install -r "C:\Users\robert\AppData\Local\Programs\ComfyUI\resources\ComfyUI\requirements.txt"
.venv\Scripts\pip.exe install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu124
Important question: What NVIDIA GPU do you have, and what driver version? The original error (3221225477) often points to driver issues, and since the VPN wasn't the cause, we should verify your GPU drivers are truly up to date.
To reply, just mention @dosu https://go.dosu.dev/dosubot .
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@dosubot[bot] commented on GitHub (Feb 19, 2026):
This is the key information we needed! You have an AMD Radeon RX 6900 XT, not an NVIDIA GPU. This completely changes the troubleshooting approach.
Your GPU is not too old—it's a capable card. The problem is that:
I gave you the wrong PyTorch install command. The
cu124URL is for NVIDIA CUDA GPUs. AMD GPUs need ROCm-based PyTorch instead.ComfyUI Desktop does support AMD GPUs on Windows, but AMD support is less mature than NVIDIA and the automatic installation needs to detect your GPU correctly to install the right packages.
Let's try a fresh automatic install:
C:\ComfyUIfolder completely (including the.venvwe manually created with the wrong packages)%APPDATA%\ComfyUIThe installer should automatically detect your RX 6900 XT and install ROCm + AMD-compatible PyTorch. Watch the installation—it should show it's installing AMD/ROCm packages, not CUDA.
If that still fails, let me know what messages you see during installation. Your RX 6900 XT should work—we just need the correct AMD-specific packages installed.
To reply, just mention @dosu.
Docs are dead. Just use Dosu.
@ukfliers-coder commented on GitHub (Feb 20, 2026):
I appreciate everything you are doing, but this is where we started. It did detect that it was AMD and installed with no error message that I can see as the readout is only about 10% transparent behind the black install dialog box.
I have deleted everything except the python folder in programs
Thanks,
From: dosubot[bot] @.>
Sent: Thursday, February 19, 2026 6:51 PM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3930776992
This is the key information we needed! You have an AMD Radeon RX 6900 XT, not an NVIDIA GPU. This completely changes the troubleshooting approach.
Your GPU is not too old—it's a capable card. The problem is that:
Let's try a fresh automatic install:
The installer should automatically detect your RX 6900 XT and install ROCm + AMD-compatible PyTorch. Watch the installation—it should show it's installing AMD/ROCm packages, not CUDA.
If that still fails, let me know what messages you see during installation. Your RX 6900 XT should work—we just need the correct AMD-specific packages installed.
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@dosubot[bot] commented on GitHub (Feb 20, 2026):
I understand the frustration, Robert. We've been going in circles and I apologize for that.
Given that:
.venvThis looks like a genuine bug where the installation process is failing silently during the Python/ROCm setup phase for AMD GPUs. AMD support is known to have stability issues that are still being worked on.
To help the maintainers diagnose this:
Could you share the fresh
main.logfile from%APPDATA%\ComfyUI\Logs\? This log should show exactly what happened during installation—specifically whether ROCm and the AMD Python packages were downloaded and installed, or if something failed silently.Also, after this latest install attempt, can you confirm:
C:\ComfyUI\.venv\Scripts\folder exist?This information will help identify where the AMD installation is breaking. At this point, I believe this needs attention from the ComfyUI Desktop maintainers since the standard troubleshooting hasn't resolved the issue.
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@ukfliers-coder commented on GitHub (Feb 20, 2026):
This is what I have just done.
a. C:\ComfyUI
b. C:\Users\robert\Documents\ComfyUI – this contains the .venv folder.
c. C:\Users\robert\AppData\Roaming\ComfyUI.
ComfyUI does not run
Thanks,
From: dosubot[bot] @.>
Sent: Friday, February 20, 2026 7:30 AM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3933970477
I understand the frustration, Robert. We've been going in circles and I apologize for that.
Given that:
This looks like a genuine bug where the installation process is failing silently during the Python/ROCm setup phase for AMD GPUs. AMD support is known to have stability issues https://github.com/Comfy-Org/desktop/issues/1605 that are still being worked on.
To help the maintainers diagnose this:
Could you share the fresh main.log file from %APPDATA%\ComfyUI\Logs? This log should show exactly what happened during installation—specifically whether ROCm and the AMD Python packages were downloaded and installed, or if something failed silently.
Also, after this latest install attempt, can you confirm:
This information will help identify where the AMD installation is breaking. At this point, I believe this needs attention from the ComfyUI Desktop maintainers since the standard troubleshooting hasn't resolved the issue.
To reply, just mention @dosu https://go.dosu.dev/dosubot .
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@dosubot[bot] commented on GitHub (Feb 20, 2026):
Thank you for the detailed step-by-step, Robert. This confirms the installation appears to proceed normally but the Python environment is failing to set up properly.
Important clarification: You mentioned the
.venvfolder is inC:\Users\robert\Documents\ComfyUI(step 7 was your user data path). Can you please check:C:\Users\robert\Documents\ComfyUI\.venv\Scripts\python.exeexist?main.logfile fromC:\Users\robert\AppData\Roaming\ComfyUI\Logs\?The log file is critical—it will show exactly where the installation is failing (Python download, ROCm packages, PyTorch, etc.).
Side note about the black dialog box: The poor text visibility is a known UI issue. You might be able to view the installation output in the log file instead.
If you can attach the
main.logfile to this issue, it will help the maintainers see exactly what's happening during the AMD/ROCm installation phase. This does appear to be a bug specific to AMD GPU setup that needs developer attention.To reply, just mention @dosu.
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@ukfliers-coder commented on GitHub (Feb 20, 2026):
Python.exe does not exist in .venv
Thanks,
From: dosubot[bot] @.>
Sent: Friday, February 20, 2026 8:06 AM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3934366008
Thank you for the detailed step-by-step, Robert. This confirms the installation appears to proceed normally but the Python environment is failing to set up properly.
Important clarification: You mentioned the .venv folder is in C:\Users\robert\Documents\ComfyUI (step 7 was your user data path). Can you please check:
The log file is critical—it will show exactly where the installation is failing (Python download, ROCm packages, PyTorch, etc.).
Side note about the black dialog box: The poor text visibility is a known UI issue. You might be able to view the installation output in the log file instead.
If you can attach the main.log file to this issue, it will help the maintainers see exactly what's happening during the AMD/ROCm installation phase. This does appear to be a bug specific to AMD GPU setup that needs developer attention.
To reply, just mention @dosu https://go.dosu.dev/dosubot .
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@dosubot[bot] commented on GitHub (Feb 20, 2026):
That confirms the root issue—Python is failing to download/install during setup. The
main.logfile will show exactly why.Could you please attach the
main.logfile from:This file will contain the detailed installation output showing where the Python environment setup failed. Without it, we can't determine if this is:
Once you share the log, the maintainers will have the information needed to investigate this AMD installation failure.
To reply, just mention @dosu.
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@ukfliers-coder commented on GitHub (Feb 20, 2026):
It was attached – attached again.
Thanks,
From: dosubot[bot] @.>
Sent: Friday, February 20, 2026 8:25 AM
To: Comfy-Org/desktop @.>
Cc: ukfliers-coder @.>; Mention @.>
Subject: Re: [Comfy-Org/desktop] [Bug]: ComfyUI will not start (new install) (Issue #1611)
dosubot[bot] left a comment (Comfy-Org/desktop#1611) https://github.com/Comfy-Org/desktop/issues/1611#issuecomment-3934565305
That confirms the root issue—Python is failing to download/install during setup. The main.log file will show exactly why.
Could you please attach the main.log file from:
C:\Users\robert\AppData\Roaming\ComfyUI\Logs\main.log
This file will contain the detailed installation output showing where the Python environment setup failed. Without it, we can't determine if this is:
Once you share the log, the maintainers will have the information needed to investigate this AMD installation failure.
To reply, just mention @dosu https://go.dosu.dev/dosubot .
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@dosubot[bot] commented on GitHub (Feb 20, 2026):
My apologies Robert—I don't have access to view attachments in email replies. The log file you attached needs to be uploaded directly to the GitHub issue for me and the maintainers to see it.
Could you please:
main.logfile into a comment, or click the "Attach files" optionOnce the log is visible on GitHub, I'll be able to analyze it and help identify the exact cause of the Python installation failure.
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@ukfliers-coder commented on GitHub (Feb 20, 2026):
main.log
all new to me...
@MseSpotlite commented on GitHub (Mar 15, 2026):
dam i got to the bottom and no answer to the problem. lol
@JiwaniZakir commented on GitHub (Apr 2, 2026):
The validation passes cleanly (all components including
pythonPackages,venv,vcRedistreport OK), so the installation itself is intact — the crash is happening at server startup, right after the log is cut off at[info] S. Exit code322122547(0x13333333) withsignal: nullon Windows is not a standard NTSTATUS code, which suggests the Python process is either being terminated by a GPU/CUDA driver fault (e.g., an access violation caught and re-coded by the runtime) or crashing before it can emit a Python-level traceback. A likely culprit is a CUDA initialization failure or incompatible driver that only surfaces when PyTorch actually tries to enumerate GPU devices at startup — the--dry-runpip validation won't catch this. Checking for acomfyui.logorstderroutput from the Python child process (as opposed to the Electron main log) would confirm whether a CUDA/GPU error is being emitted before the process dies.@adrianmb427 commented on GitHub (May 1, 2026):
I had the same problem, and I found a solution that worked for me. Solution Up Front: try making sure all monitors are connected to the highest end GPU you have installed. Especially since many CPU have integrated GPUs now that may be causing conflicts.
I have 3GPUS, an integrated one with my AMD CPU 9900X, and older AMD RX590 and and AMD RX7600XT. I didn't have any issues with all 3 active when i first set it up, I had all monitors connects to the RX7600XT. I had changed one monitor to go into the RX590 and the issue presented.
I'm guessing since it was more active it probably busted one of the GPU checks in the main.py. If i disable that card in device manager. I can start ComfyUI no problem. After i can re-enable and no issues running ComfyUI. I checked and switched that monitor from the RX590 to the integrated HDMI port on my motherboard and same behavior. I disabled the integrated and ComfyUI worked again. My guess the checks aren't robust enough to manage that some monitors may be connected to other GPUs even if you want to use them for graphics and use the higher end one for AI model use etc.
Try making sure all monitors are connected to the highest end GPU to resolve this error. Hope that helps someone and hopefully a developer sees this and addresses this issue to allow other GPUs to manage other graphics tasks while the compatible GPU is used for AI models.
@ukfliers-coder commented on GitHub (May 1, 2026):
Both monitors a running on 1 GPU
@gbjbaanb commented on GitHub (Jun 15, 2026):
Same issue here. AMD gfx card and intel iGPU connected to 2 monitors.
During install of Comfy Desktop it detects the AMD card, in the "new instance" dialog it also says "Detected GPU: AMD" correctly.
Running the "create new instance" and I get errors regarding cuda. Disconnecting the 2nd monitor doesn't resolve it, and TBH I don't want to go the whole hog of uninstalling the intel gfx driver!
-- relevant part of the log file:
** ComfyUI startup time: 2026-06-15 15:04:45.450
** Platform: Windows
** Python version: 3.12.12 (main, Feb 12 2026, 00:40:26) [MSC v.1944 64 bit (AMD64)]
** Python executable: E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI.venv\Scripts\python.exe
** ComfyUI Path: E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI
** ComfyUI Base Folder Path: E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI
** User directory: E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI\user
** ComfyUI-Manager config path: E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI\user__manager\config.ini
** Log path: E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI\user\comfyui.log
[INFO] [PRE] ComfyUI-Manager
[WARNING] failed to run offload-arch: binary not found.
Windows fatal exception: access violation
Stack (most recent call first):
File "E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI.venv\Lib\site-packages\torch\cuda_init_.py", line 182 in is_available
File "E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI.venv\Lib\site-packages\comfy_kitchen\backends\cuda_init_.py", line 1138 in register
File "E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI.venv\Lib\site-packages\comfy_kitchen\backends\cuda_init.py", line 1149 in
File "", line 488 in _call_with_frames_removed
File "", line 999 in exec_module
File "", line 935 in _load_unlocked
File "", line 1331 in _find_and_load_unlocked
File "", line 1360 in _find_and_load
File "", line 488 in _call_with_frames_removed
File "", line 1415 in handle_fromlist
File "E:\ComfyUI-Installs\ComfyUI (1)\ComfyUI.venv\Lib\site-packages\comfy_kitchen_init.py", line 3 in