From 1e4e342f54386ea4179b273c24b37bd8cbde8f37 Mon Sep 17 00:00:00 2001
From: comfyanonymous <121283862+comfyanonymous@users.noreply.github.com>
Date: Fri, 26 Dec 2025 19:03:01 -0800
Subject: [PATCH] Fix noise with ancestral samplers when inferencing on cpu.
 (#11528)

---
 comfy/k_diffusion/sampling.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/comfy/k_diffusion/sampling.py b/comfy/k_diffusion/sampling.py
index 1ba9edad7..0949dee44 100644
--- a/comfy/k_diffusion/sampling.py
+++ b/comfy/k_diffusion/sampling.py
@@ -74,6 +74,9 @@ def get_ancestral_step(sigma_from, sigma_to, eta=1.):
 
 def default_noise_sampler(x, seed=None):
     if seed is not None:
+        if x.device == torch.device("cpu"):
+            seed += 1
+
         generator = torch.Generator(device=x.device)
         generator.manual_seed(seed)
     else: