Black output

#1
by ruleez - opened

getting only black output images, image breaks around the 17th step:
RuntimeWarning: invalid value encountered in cast
img = Image.fromarray(np.clip(i, 0, 255).astype(np.uint8))

Had to remove --fast and --using-sageattention from the cmd. using the kjnode to turn off sageattention doesn't work

There seems to be similar reports of that with FP8 as well, so it may be an issue with the base ComfyUI code https://github.com/comfyanonymous/ComfyUI/issues/9184

Same problem out of 20 steps it becomes black on 11-th step even in Sampler preview

The Q4_K_M failed due to unexpected architecture, so I downloaded the Q6_K.....same issue, neither run πŸ€·β€β™€οΈ
Screenshot 2025-08-05 175851.png

image.png

Hope you can fix them as I love your work πŸ’œ

@Apolonia you have to update ComfyUI-GGUF to the latest version for it to be loadable, as well as update ComfyUI itself. Should work both via the manager and via just git pull.

@city96 Hiya....I updated comfy this morning, nothing was said about the GGUF nodes though?
Edit: GGUF updated, problem solved.
Thank you for the heads up πŸ’œ

Launching comfy without FP16 accumulation & Sageattention solved the problem of black image, generation was increased by about (4s/it) but got some good result with Q4-0
ComfyUI_00114_.png

Had to remove --fast and --using-sageattention from the cmd. using the kjnode to turn off sageattention doesn't work

I am using the official Diffusers script to load the model offline, but I get a completely black image. How to solve it?

How do I disable -fast & -sage if I never used it in workflow at all ????

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