Nvidia 5080 Not being detected as CUDA GPU

[The-Architect]

✅ Issue Solved on RTX 5080 — Full Compatibility Achieved
Hey everyone, I was hitting the same CUDA sm_120 block and runtime errors on the RTX 5080. After deep debugging and patching attempts, I finally found a clean workaround:

1. Install PyTorch Nightly with CUDA 12.8:
   bash
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   pip install --pre torch torchvision torchaudio --index-url https://download.pytorch.org/whl/nightly/cu128
2. Install or update
   
   bitsandbytes
   manually (for CUDA 128 support):
   • https://github.com/bitsandbytes-cuda/bit...s/releases
     
3. Fix the missing
   
   libbitsandbytes_cuda128.so
   :
   • Search for it (possibly in ComfyUI or Forge folder) and manually copy it to your target venv path:
     swift
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     your_venv_path/lib/site-packages/bitsandbytes/
4. (If needed) Downgrade Triton:
   bash
   CopyEdit
   
   pip install triton==3.1.0

Everything now runs smoothly on my RTX 5080, including WebUI Forge and Diffusers. Let me know if anyone needs help replicating this.
Repo with fix and driver insights coming soon. Marking this as Solved.
— The Architect