diff --git a/services/inputflinger/tests/InputReader_test.cpp b/services/inputflinger/tests/InputReader_test.cpp
index 0c2742f..e7313a2 100644
--- a/services/inputflinger/tests/InputReader_test.cpp
+++ b/services/inputflinger/tests/InputReader_test.cpp
@@ -10420,6 +10420,46 @@
     ASSERT_GT(motionArgs.pointerCoords[0].getAxisValue(AMOTION_EVENT_AXIS_GESTURE_Y_OFFSET), 0);
 }
 
+TEST_F(MultiTouchPointerModeTest, WhenViewportActiveStatusChanged_PointerGestureIsReset) {
+    preparePointerMode(25 /*xResolution*/, 25 /*yResolution*/);
+    mFakeEventHub->addKey(EVENTHUB_ID, BTN_TOOL_PEN, 0, AKEYCODE_UNKNOWN, 0);
+    MultiTouchInputMapper& mapper = addMapperAndConfigure<MultiTouchInputMapper>();
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyDeviceResetWasCalled());
+
+    // Start a stylus gesture.
+    processKey(mapper, BTN_TOOL_PEN, 1);
+    processId(mapper, FIRST_TRACKING_ID);
+    processPosition(mapper, 100, 200);
+    processSync(mapper);
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyMotionWasCalled(
+            AllOf(WithMotionAction(AMOTION_EVENT_ACTION_DOWN),
+                  WithSource(AINPUT_SOURCE_MOUSE | AINPUT_SOURCE_STYLUS),
+                  WithToolType(AMOTION_EVENT_TOOL_TYPE_STYLUS))));
+    // TODO(b/257078296): Pointer mode generates extra event.
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyMotionWasCalled(
+            AllOf(WithMotionAction(AMOTION_EVENT_ACTION_MOVE),
+                  WithSource(AINPUT_SOURCE_MOUSE | AINPUT_SOURCE_STYLUS),
+                  WithToolType(AMOTION_EVENT_TOOL_TYPE_STYLUS))));
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyMotionWasNotCalled());
+
+    // Make the viewport inactive. This will put the device in disabled mode, and the ongoing stylus
+    // gesture should be disabled.
+    auto viewport = mFakePolicy->getDisplayViewportByType(ViewportType::INTERNAL);
+    viewport->isActive = false;
+    mFakePolicy->updateViewport(*viewport);
+    configureDevice(InputReaderConfiguration::CHANGE_DISPLAY_INFO);
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyMotionWasCalled(
+            AllOf(WithMotionAction(AMOTION_EVENT_ACTION_CANCEL),
+                  WithSource(AINPUT_SOURCE_MOUSE | AINPUT_SOURCE_STYLUS),
+                  WithToolType(AMOTION_EVENT_TOOL_TYPE_STYLUS))));
+    // TODO(b/257078296): Pointer mode generates extra event.
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyMotionWasCalled(
+            AllOf(WithMotionAction(AMOTION_EVENT_ACTION_CANCEL),
+                  WithSource(AINPUT_SOURCE_MOUSE | AINPUT_SOURCE_STYLUS),
+                  WithToolType(AMOTION_EVENT_TOOL_TYPE_STYLUS))));
+    ASSERT_NO_FATAL_FAILURE(mFakeListener->assertNotifyMotionWasNotCalled());
+}
+
 // --- JoystickInputMapperTest ---
 
 class JoystickInputMapperTest : public InputMapperTest {