diff --git a/CHANGES b/CHANGES
index 9af83621279..a5725b0d518 100644
--- a/CHANGES
+++ b/CHANGES
@@ -16,7 +16,7 @@ Features added
 * #9815: html theme: Wrap sidebar components in div to allow customizing their
   layout via CSS
 * #9831: Autosummary now documents only the members specified in a module's
-  ``__all__`` attribute if :confval:`autosummary_ignore___all__` is set to
+  ``__all__`` attribute if :confval:`autosummary_ignore_module_all` is set to
   ``False``. The default behaviour is unchanged. Autogen also now supports
   this behavior with the ``--respect-module-all`` switch.
 
diff --git a/sphinx/ext/autosummary/__init__.py b/sphinx/ext/autosummary/__init__.py
index b8691b3dae3..298c9013802 100644
--- a/sphinx/ext/autosummary/__init__.py
+++ b/sphinx/ext/autosummary/__init__.py
@@ -826,6 +826,6 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_config_value('autosummary_mock_imports',
                          lambda config: config.autodoc_mock_imports, 'env')
     app.add_config_value('autosummary_imported_members', [], False, [bool])
-    app.add_config_value('autosummary_ignore___all__', True, 'env', bool)
+    app.add_config_value('autosummary_ignore_module_all', True, 'env', bool)
 
     return {'version': sphinx.__display_version__, 'parallel_read_safe': True}
diff --git a/sphinx/ext/autosummary/generate.py b/sphinx/ext/autosummary/generate.py
index 05363f3c71b..dd712d80281 100644
--- a/sphinx/ext/autosummary/generate.py
+++ b/sphinx/ext/autosummary/generate.py
@@ -68,7 +68,7 @@ def __init__(self, translator: NullTranslations) -> None:
 
         self.config.add('autosummary_context', {}, True, None)
         self.config.add('autosummary_filename_map', {}, True, None)
-        self.config.add('autosummary_ignore___all__', True, 'env', bool)
+        self.config.add('autosummary_ignore_module_all', True, 'env', bool)
         self.config.init_values()
 
     def emit_firstresult(self, *args: Any) -> None:
@@ -219,7 +219,7 @@ def scan(self, imported_members: bool) -> List[str]:
             elif imported is False:
                 # list not-imported members
                 members.append(name)
-            elif '__all__' in dir(self.object) and not self.app.config.autosummary_ignore___all__:
+            elif '__all__' in dir(self.object) and not self.app.config.autosummary_ignore_module_all:
                 # list members that have __all__ set
                 members.append(name)
 
@@ -228,9 +228,9 @@ def scan(self, imported_members: bool) -> List[str]:
 def members_of(conf: Config, obj: Any) -> Sequence[str]:
     """Get the members of ``obj``, possibly ignoring the ``__all__`` module attribute
 
-    Follows the ``conf.autosummary_ignore___all__`` setting."""
+    Follows the ``conf.autosummary_ignore_module_all`` setting."""
 
-    if conf.autosummary_ignore___all__:
+    if conf.autosummary_ignore_module_all:
         return dir(obj)
     else:
         return getall(obj) or dir(obj)
@@ -645,8 +645,8 @@ def get_parser() -> argparse.ArgumentParser:
                         dest='imported_members', default=False,
                         help=__('document imported members (default: '
                                 '%(default)s)'))
-    parser.add_argument('-a', '--respect-module-all', action='store_false',
-                        dest='ignore___all__', default=True,
+    parser.add_argument('-a', '--respect-module-all', action='store_true',
+                        dest='respect_module_all', default=False,
                         help=__('document exactly the members in module __all__ attribute. '
                                 '(default: %(default)s)'))
 
@@ -665,7 +665,7 @@ def main(argv: List[str] = sys.argv[1:]) -> None:
 
     if args.templates:
         app.config.templates_path.append(path.abspath(args.templates))
-    app.config.autosummary_ignore___all__ = args.ignore___all__
+    app.config.autosummary_ignore_module_all = not args.respect_module_all
 
     generate_autosummary_docs(args.source_file, args.output_dir,
                               '.' + args.suffix,
diff --git a/tests/test_ext_autosummary.py b/tests/test_ext_autosummary.py
index dd9b8c51930..0c35b9e3eea 100644
--- a/tests/test_ext_autosummary.py
+++ b/tests/test_ext_autosummary.py
@@ -238,7 +238,7 @@ def test_autosummary_generate_content_for_module(app):
 def test_autosummary_generate_content_for_module___all__(app):
     import autosummary_dummy_module
     template = Mock()
-    app.config.autosummary_ignore___all__ = False
+    app.config.autosummary_ignore_module_all = False
 
     generate_autosummary_content('autosummary_dummy_module', autosummary_dummy_module, None,
                                  template, None, False, app, False, {})