diff --git a/wake_alarm/tests/test_alarm_display.py b/wake_alarm/tests/test_alarm_display.py
index 6dc4900..a71f74c 100644
--- a/wake_alarm/tests/test_alarm_display.py
+++ b/wake_alarm/tests/test_alarm_display.py
@@ -127,3 +127,20 @@ class TestDisplayHelpers:
         ):
             _restore_display()
         mock_run.assert_not_called()
+
+    def test_restore_display_runs_xset_s_on_when_present(self) -> None:
+        """_restore_display re-enables the screensaver via xset when present."""
+        with (
+            patch(
+                "python_pkg.wake_alarm._alarm_display.shutil.which",
+                return_value="/usr/bin/xset",
+            ),
+            patch("python_pkg.wake_alarm._alarm_display.subprocess.run") as mock_run,
+        ):
+            _restore_display()
+        mock_run.assert_called_once_with(
+            ["/usr/bin/xset", "s", "on"],
+            check=False,
+            capture_output=True,
+            timeout=5,
+        )
diff --git a/wake_alarm/tests/test_alarm_part2.py b/wake_alarm/tests/test_alarm_part2.py
index e7a7181..81b60c8 100644
--- a/wake_alarm/tests/test_alarm_part2.py
+++ b/wake_alarm/tests/test_alarm_part2.py
@@ -59,6 +59,7 @@ def _block_extra_devices() -> Generator[MagicMock]:
         patch("python_pkg.wake_alarm._alarm._restore_fans"),
         patch("python_pkg.wake_alarm._alarm._set_max_brightness"),
         patch("python_pkg.wake_alarm._alarm._wake_display"),
+        patch("python_pkg.wake_alarm._alarm._restore_display"),
         patch("python_pkg.wake_alarm._alarm._warn_if_no_real_sink"),
         patch("python_pkg.wake_alarm._alarm._activate_alarm_audio", return_value=None),
         patch("python_pkg.wake_alarm._alarm._restore_alarm_audio"),
diff --git a/wake_alarm/tests/test_alarm_part3.py b/wake_alarm/tests/test_alarm_part3.py
index 249c4d5..f2772f4 100644
--- a/wake_alarm/tests/test_alarm_part3.py
+++ b/wake_alarm/tests/test_alarm_part3.py
@@ -58,6 +58,7 @@ def _block_extra_devices() -> Generator[MagicMock]:
         patch("python_pkg.wake_alarm._alarm._restore_fans"),
         patch("python_pkg.wake_alarm._alarm._set_max_brightness"),
         patch("python_pkg.wake_alarm._alarm._wake_display"),
+        patch("python_pkg.wake_alarm._alarm._restore_display"),
         patch("python_pkg.wake_alarm._alarm._warn_if_no_real_sink"),
         patch("python_pkg.wake_alarm._alarm._activate_alarm_audio", return_value=None),
         patch("python_pkg.wake_alarm._alarm._restore_alarm_audio"),
diff --git a/wake_alarm/tests/test_alarm_part4.py b/wake_alarm/tests/test_alarm_part4.py
index b091264..31e52a5 100644
--- a/wake_alarm/tests/test_alarm_part4.py
+++ b/wake_alarm/tests/test_alarm_part4.py
@@ -56,6 +56,7 @@ def _block_extra_devices() -> Generator[MagicMock]:
         patch("python_pkg.wake_alarm._alarm._restore_fans"),
         patch("python_pkg.wake_alarm._alarm._set_max_brightness"),
         patch("python_pkg.wake_alarm._alarm._wake_display"),
+        patch("python_pkg.wake_alarm._alarm._restore_display"),
         patch("python_pkg.wake_alarm._alarm._warn_if_no_real_sink"),
         patch("python_pkg.wake_alarm._alarm._activate_alarm_audio", return_value=None),
         patch("python_pkg.wake_alarm._alarm._restore_alarm_audio"),