Wan 2.2 Suddenly Outputs Wavy Abstract Video; Blackwell fp16 Instability Suspected
deviruchii · reddit · 2026-09-13
A user who had been generating 5-second videos with Wan 2.2 16fp i2v found outputs suddenly turning into wavy abstract animations, with no ComfyUI or other updates in between.
After ruling out causes (disabling sage attention did nothing), switching to fp8 models restored working generations. Claude judged the RTX 5090 (32GB VRAM) + 32GB RAM setup sufficient and pinpointed Blackwell fp16 accumulation instability as the likely culprit — though the author notes this may be AI false assertion rather than proven fact, and is asking the community for insight.
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