[Fix] Fall back to triton MOE for GPT-OSS on Blackwell with driver >= 595 (#21780)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

python/sglang/check_env.py

@@ -194,22 +194,12 @@ class GPUEnv(BaseEnv):
         """
         Get CUDA driver version.
         """
-        versions = set()
-        try:
-            output = subprocess.check_output(
-                [
-                    "nvidia-smi",
-                    "--query-gpu=driver_version",
-                    "--format=csv,noheader,nounits",
-                ]
-            )
-            versions = set(output.decode().strip().split("\n"))
-            if len(versions) == 1:
-                return {"CUDA Driver Version": versions.pop()}
-            else:
-                return {"CUDA Driver Versions": ", ".join(sorted(versions))}
-        except subprocess.SubprocessError:
+        from sglang.srt.utils.common import get_nvidia_driver_version_str
+
+        ver = get_nvidia_driver_version_str()
+        if ver is None:
             return {"CUDA Driver Version": "Not Available"}
+        return {"CUDA Driver Version": ver}
 
     def get_topology(self):
         """