Can't get ComfyUI working on AMD

[ThatIvanGuy]

I just downloaded ComfyUI_windows_portable_amd.7z the other day and it doesn't seem to be working for me. Trying to figure out what could have gone wrong here. D: is my old old DVD. The reference to D:\a\ makes no sense.

I'll paste my CMD output. Maybe someone can tell me what happened?

C:\AI>run_amd_gpu.bat

C:\AI>.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build
←[32m[INFO]←[0m setup plugin alembic.autogenerate.schemas
←[32m[INFO]←[0m setup plugin alembic.autogenerate.tables
←[32m[INFO]←[0m setup plugin alembic.autogenerate.types
←[32m[INFO]←[0m setup plugin alembic.autogenerate.constraints
←[32m[INFO]←[0m setup plugin alembic.autogenerate.defaults
←[32m[INFO]←[0m setup plugin alembic.autogenerate.comments
Fatal error in launcher: Unable to create process using '"D:\a\ComfyUI\python_embeded\python.exe" "C:\AI\python_embeded\Scripts\offload-arch.exe" ': The system cannot find the file specified.

[WARNING] offload-arch failed with return code 1
[stderr]
Windows fatal exception: access violation

Stack (most recent call first):
File "C:\AI\python_embeded\Lib\site-packages\torch\cuda_init_.py", line 182 in is_available
File "C:\AI\python_embeded\Lib\site-packages\comfy_kitchen\backends\cuda_init_.py", line 3032 in register
File "C:\AI\python_embeded\Lib\site-packages\comfy_kitchen\backends\cuda_init.py", line 3043 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 "C:\AI\python_embeded\Lib\site-packages\comfy_kitchen_init.py", line 3 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 "C:\AI\ComfyUI\comfy\quant_ops.py", line 23 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 "C:\AI\ComfyUI\comfy\memory_management.py", line 8 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 "C:\AI\ComfyUI\comfy\utils.py", line 25 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 "C:\AI\ComfyUI\main.py", line 229 in

C:\AI>pause
Press any key to continue . . .

C:\AI>

[chanse-syres]

The `D:\a\ComfyUI` path didn't come from your computer. It's the GitHub Actions build directory that accidentally embedded in the portable packages generated by `offload-arch.exe` launcher of the AMD.

It's the same packaging defect that's reported in #15097. The portable build effectively installed the ROCm package _before_ relocating the embedded Python directory, which caused the generated launcher to retain the original CI path.

Because your `D:` is on a DVD drive, I wouldn't use the junction workaround from that issue. The proper fix would be a repacked archive or regenerating the launcher against `C:\AI\python_embeded\python.exe`.

There's also potentially a second problem: The later access violation occurs inside `torch.cuda.is_available()`. If the launcher path is fixed, it might remove the `offload-arch` warning w/o fixing the ROCm crash.

What's the exact AMD GPU and driver version that you're using? If a the first warning is removed from a corrected launcher, but the access violation persists, that will confirm if it's a separate GPU/driver compatibility issue.

[ThatIvanGuy]

Thanks for the response. Here's the info you asked for.

The card is an RX 6800 XT
Driver Version 25.10.43.01-260218a-198633C-AMD-Software-Adrenalin-Edition
Adrenalin version 26.2.2 (i should update some day)

[AlfredSartan572]

This is an annoying issue that they don't seem to be willing to fix (see my original post from way back: #11546 )
You will first need to assign a different drive letter for your cd-rom (for example E:, using the Disk Management utility), so that drive letter D: becomes available.
Then, assuming you have comfyui installed in C:\Comfy :

    create folder C:\a
    start cmd.exe as administrator and type:
    C:
    cd \a
    mklink /D ComfyUI C:\Comfy
       (now "C:\a\ComfyUI\python_embeded" is actually "C:\Comfy\python_embeded"
    then, in the run_amd_gpu.bat file, add:
    just before "python.exe -s .\ComfyUI\main.py", add this line : subst D: C:\
    just after "python.exe -s .\ComfyUI\main.py", add this line : subst D: /d

The "subst" will make the D: drive point to the C: drive
And the "mklink" will make c:\a\... point to your actual comfyui installation.

I have since switched from Windows to Linux and can no longer test things out on Windows, but hopefully this old and ugly hack still works. Best of luck.