fix sampler set timesteps vs sigmas

Signed-off-by: Vladimir Mandic <mandic00@live.com>

CHANGELOG.md

@@ -1,8 +1,8 @@
 # Change Log for SD.Next
 
-## Update for 2025-09-06
+## Update for 2025-09-07
 
-### Highlights for 2025-09-06
+### Highlights for 2025-09-07
 
 *What's new*? Big one is that we're (finally) switching the default UI to **ModernUI**!  
 StandardUI is still available and can be selected in settings, but ModernUI is now the default for new installs  
@@ -11,7 +11,7 @@ Also, there are quite a few offloading improvements and many quality-of-life cha
 
 [ReadMe](https://github.com/vladmandic/automatic/blob/master/README.md) | [ChangeLog](https://github.com/vladmandic/automatic/blob/master/CHANGELOG.md) | [Docs](https://vladmandic.github.io/sdnext-docs/) | [WiKi](https://github.com/vladmandic/automatic/wiki) | [Discord](https://discord.com/invite/sd-next-federal-batch-inspectors-1101998836328697867)
 
-### Details for 2025-09-06
+### Details for 2025-09-07
 
 - **Models**
   - **Chroma** final versions: [Chroma1-HD](https://huggingface.co/lodestones/Chroma1-HD), [Chroma1-Base](https://huggingface.co/lodestones/Chroma1-Base) and [Chroma1-Flash](https://huggingface.co/lodestones/Chroma1-Flash)  
@@ -97,6 +97,7 @@ Also, there are quite a few offloading improvements and many quality-of-life cha
   - fix zluda flash attention with enable_gqa  
   - fix `wan a14b` quantization  
   - fix reprocess workflow for control with hires  
+  - fix samplers set timesteps vs sigmas  
 
 ## Update for 2025-08-20
 

modules/processing_args.py

@@ -240,36 +240,20 @@ def set_pipeline_args(p, model, prompts:list, negative_prompts:list, prompts_2:t
         else:
             args['clip_skip'] = clip_skip - 1
 
-    if 'timesteps' in possible:
-        timesteps = re.split(',| ', shared.opts.schedulers_timesteps)
-        timesteps = [int(x) for x in timesteps if x.isdigit()]
-        if len(timesteps) > 0:
-            if hasattr(model.scheduler, 'set_timesteps') and "timesteps" in set(inspect.signature(model.scheduler.set_timesteps).parameters.keys()):
-                try:
-                    args['timesteps'] = timesteps
-                    p.steps = len(timesteps)
-                    p.timesteps = timesteps
-                    steps = p.steps
-                    shared.log.debug(f'Sampler: steps={len(timesteps)} timesteps={timesteps}')
-                except Exception as e:
-                    shared.log.error(f'Sampler timesteps: {e}')
-            else:
-                shared.log.warning(f'Sampler: cls={model.scheduler.__class__.__name__} timesteps not supported')
-    if 'sigmas' in possible:
-        sigmas = re.split(',| ', shared.opts.schedulers_timesteps)
-        sigmas = [float(x)/1000.0 for x in sigmas if x.isdigit()]
-        if len(sigmas) > 0:
-            if hasattr(model.scheduler, 'set_timesteps') and "sigmas" in set(inspect.signature(model.scheduler.set_timesteps).parameters.keys()):
-                try:
-                    args['sigmas'] = sigmas
-                    p.steps = len(sigmas)
-                    p.timesteps = sigmas
-                    steps = p.steps
-                    shared.log.debug(f'Sampler: steps={len(sigmas)} sigmas={sigmas}')
-                except Exception as e:
-                    shared.log.error(f'Sampler sigmas: {e}')
-            else:
-                shared.log.warning(f'Sampler: cls={model.scheduler.__class__.__name__} sigmas not supported')
+    timesteps = re.split(',| ', shared.opts.schedulers_timesteps)
+    if len(timesteps) > 0:
+        if ('timesteps' in possible) and hasattr(model.scheduler, 'set_timesteps') and ("timesteps" in set(inspect.signature(model.scheduler.set_timesteps).parameters.keys())):
+            p.timesteps = [int(x) for x in timesteps if x.isdigit()]
+            p.steps = len(timesteps)
+            args['timesteps'] = p.timesteps
+            shared.log.debug(f'Sampler: steps={len(p.timesteps)} timesteps={p.timesteps}')
+        elif ('sigmas' in possible) and hasattr(model.scheduler, 'set_timesteps') and ("sigmas" in set(inspect.signature(model.scheduler.set_timesteps).parameters.keys())):
+            p.timesteps = [float(x)/1000.0 for x in timesteps if x.isdigit()]
+            args['sigmas'] = p.timesteps
+            p.steps = len(p.timesteps)
+            shared.log.debug(f'Sampler: steps={len(p.timesteps)} sigmas={p.timesteps}')
+        else:
+            shared.log.warning(f'Sampler: cls={model.scheduler.__class__.__name__} timesteps not supported')
 
     if hasattr(model, 'scheduler') and hasattr(model.scheduler, 'noise_sampler_seed') and hasattr(model.scheduler, 'noise_sampler'):
         model.scheduler.noise_sampler = None # noise needs to be reset instead of using cached values