[Bugfix][Model] Fix Qwen3.5/Qwen3Next ignoring --dtype flag on older GPUs (#35617)

vllm/model_executor/models/qwen3_5.py

@@ -274,7 +274,6 @@ class Qwen3_5DecoderLayer(Qwen3NextDecoderLayer):
                     1,
                     1,
                     config.hidden_size,
-                    dtype=config.dtype,
                 ),
             )
             self.ffn_layer_scale = torch.nn.Parameter(
@@ -282,7 +281,6 @@ class Qwen3_5DecoderLayer(Qwen3NextDecoderLayer):
                     1,
                     1,
                     config.hidden_size,
-                    dtype=config.dtype,
                 ),
             )
 

vllm/model_executor/models/qwen3_next.py

@@ -463,7 +463,6 @@ class Qwen3NextGatedDeltaNet(nn.Module, MambaBase):
             group_size=None,
             norm_before_gate=True,
             device=current_platform.current_device(),
-            dtype=config.dtype,
         )
 
         self.out_proj = RowParallelLinear(
@@ -1018,7 +1017,6 @@ class Qwen3NextDecoderLayer(nn.Module):
                     1,
                     1,
                     config.hidden_size,
-                    dtype=config.dtype,
                 ),
             )
             self.ffn_layer_scale = torch.nn.Parameter(
@@ -1026,7 +1024,6 @@ class Qwen3NextDecoderLayer(nn.Module):
                     1,
                     1,
                     config.hidden_size,
-                    dtype=config.dtype,
                 ),
             )