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fix: run VAE in fp32 to stop black/blank generated images

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fp16 VAE produces NaNs on many SD1.5/SDXL checkpoints, yielding black
images (often mistaken for NSFW censorship - there is no NSFW filter in
the generator). Switch COMFYUI_FLAGS from --fp16-vae to --fp32-vae in
.env.example and document the fix in the README. Verified end-to-end:
a test generation now produces a real image (mean ~86) instead of black.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
TBNilles
2026-06-07 16:56:46 -04:00
parent 15e0dc3772
commit c2b0f202bf
2 changed files with 9 additions and 2 deletions
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.env.example
+3 -1
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@@ -16,8 +16,10 @@ COMFYUI_PORT=8188
# Key: DON'T use --gpu-only - it fights the unified memory fabric
# --disable-pinned-memory: reduces overhead on unified fabric
# --force-fp16 + --fp16-*: enables SageAttention optimization
# --fp32-vae: run the VAE in fp32 - fp16 VAE produces NaNs -> BLACK images on
# many SD1.5/SDXL checkpoints. (Use --bf16-vae instead for a faster compromise.)
# --dont-upcast-attention: keeps attention in FP16 for speed
COMFYUI_FLAGS=--listen 0.0.0.0 --port 8188 --disable-pinned-memory --force-fp16 --fp16-unet --fp16-vae --fp16-text-enc --dont-upcast-attention
COMFYUI_FLAGS=--listen 0.0.0.0 --port 8188 --disable-pinned-memory --force-fp16 --fp16-unet --fp32-vae --fp16-text-enc --dont-upcast-attention
# Build refs (pin to specific commits/tags for reproducibility)
COMFYUI_REF=master