diff --git a/sphinx/ext/autodoc/__init__.py b/sphinx/ext/autodoc/__init__.py
index b61a96c8494..05681ea5eb9 100644
--- a/sphinx/ext/autodoc/__init__.py
+++ b/sphinx/ext/autodoc/__init__.py
@@ -1317,6 +1317,12 @@ def format_args(self, **kwargs: Any) -> Any:
 ]
 
 
+# Types whose __new__ signature is a pass-thru.
+_CLASS_NEW_BLACKLIST = [
+    'typing.Generic.__new__',
+]
+
+
 class ClassDocumenter(DocstringSignatureMixin, ModuleLevelDocumenter):  # type: ignore
     """
     Specialized Documenter subclass for classes.
@@ -1385,6 +1391,11 @@ def get_user_defined_function_or_method(obj: Any, attr: str) -> Any:
 
         # Now we check if the 'obj' class has a '__new__' method
         new = get_user_defined_function_or_method(self.object, '__new__')
+
+        if new is not None:
+            if "{0.__module__}.{0.__qualname__}".format(new) in _CLASS_NEW_BLACKLIST:
+                new = None
+
         if new is not None:
             self.env.app.emit('autodoc-before-process-signature', new, True)
             try:
diff --git a/tests/test_ext_autodoc.py b/tests/test_ext_autodoc.py
index e90125ba97e..904107efe5a 100644
--- a/tests/test_ext_autodoc.py
+++ b/tests/test_ext_autodoc.py
@@ -291,7 +291,6 @@ def foo3(self, d='\n'):
 
 
 @pytest.mark.skipif(sys.version_info < (3, 5), reason='typing is available since python3.5.')
-@pytest.mark.xfail
 @pytest.mark.sphinx('html', testroot='ext-autodoc')
 def test_autodoc_process_signature_typing_generic(app):
     actual = do_autodoc(app, 'class', 'target.generic_class.A', {})