diff --git a/services/inputflinger/tests/InputReader_test.cpp b/services/inputflinger/tests/InputReader_test.cpp
index fe36d42..3ce03f3 100644
--- a/services/inputflinger/tests/InputReader_test.cpp
+++ b/services/inputflinger/tests/InputReader_test.cpp
@@ -3156,7 +3156,10 @@
 
     // Set a pressure value of 0 on the stylus. It doesn't generate any events.
     const auto& RAW_PRESSURE_MAX = UinputExternalStylusWithPressure::RAW_PRESSURE_MAX;
+    // Send a non-zero value first to prevent the kernel from consuming the zero event.
+    stylus->setPressure(100);
     stylus->setPressure(0);
+    ASSERT_NO_FATAL_FAILURE(mTestListener->assertNotifyMotionWasNotCalled());
 
     // Start a finger gesture. The touch device will withhold generating any touches for
     // up to 72 milliseconds while waiting for pressure data from the external stylus.
@@ -3203,6 +3206,45 @@
     ASSERT_NO_FATAL_FAILURE(mTestListener->assertNotifyKeyWasNotCalled());
 }
 
+TEST_F(ExternalStylusIntegrationTest, UnfusedExternalStylus) {
+    const Point centerPoint = mDevice->getCenterPoint();
+
+    // Create an external stylus device that does not support pressure. It should not affect any
+    // touch pointers.
+    std::unique_ptr<UinputExternalStylus> stylus = createUinputDevice<UinputExternalStylus>();
+    ASSERT_NO_FATAL_FAILURE(mFakePolicy->assertInputDevicesChanged());
+    ASSERT_NO_FATAL_FAILURE(mTestListener->assertNotifyConfigurationChangedWasCalled());
+    const auto stylusInfo = findDeviceByName(stylus->getName());
+    ASSERT_TRUE(stylusInfo);
+
+    ASSERT_EQ(AINPUT_SOURCE_STYLUS | AINPUT_SOURCE_KEYBOARD, stylusInfo->getSources());
+
+    const auto touchscreenId = mDeviceInfo.getId();
+
+    // Start a finger gesture and ensure a finger pointer is generated for it, without waiting for
+    // pressure data from the external stylus.
+    mDevice->sendSlot(FIRST_SLOT);
+    mDevice->sendTrackingId(FIRST_TRACKING_ID);
+    mDevice->sendToolType(MT_TOOL_FINGER);
+    mDevice->sendDown(centerPoint);
+    auto waitUntil = std::chrono::system_clock::now() +
+            std::chrono::milliseconds(ns2ms(EXTERNAL_STYLUS_DATA_TIMEOUT));
+    mDevice->sendSync();
+    ASSERT_NO_FATAL_FAILURE(
+            mTestListener
+                    ->assertNotifyMotionWasCalled(AllOf(WithMotionAction(AMOTION_EVENT_ACTION_DOWN),
+                                                        WithToolType(
+                                                                AMOTION_EVENT_TOOL_TYPE_FINGER),
+                                                        WithButtonState(0),
+                                                        WithDeviceId(touchscreenId),
+                                                        WithPressure(1.f)),
+                                                  waitUntil));
+
+    // The external stylus did not generate any events.
+    ASSERT_NO_FATAL_FAILURE(mTestListener->assertNotifyMotionWasNotCalled());
+    ASSERT_NO_FATAL_FAILURE(mTestListener->assertNotifyKeyWasNotCalled());
+}
+
 // --- InputDeviceTest ---
 class InputDeviceTest : public testing::Test {
 protected:
diff --git a/services/inputflinger/tests/TestInputListener.cpp b/services/inputflinger/tests/TestInputListener.cpp
index a1299ee..2801072 100644
--- a/services/inputflinger/tests/TestInputListener.cpp
+++ b/services/inputflinger/tests/TestInputListener.cpp
@@ -69,16 +69,18 @@
     ASSERT_NO_FATAL_FAILURE(assertNotCalled<NotifyKeyArgs>("notifyKey() should not be called."));
 }
 
-void TestInputListener::assertNotifyMotionWasCalled(NotifyMotionArgs* outEventArgs) {
+void TestInputListener::assertNotifyMotionWasCalled(NotifyMotionArgs* outEventArgs,
+                                                    std::optional<TimePoint> waitUntil) {
     ASSERT_NO_FATAL_FAILURE(
             assertCalled<NotifyMotionArgs>(outEventArgs,
-                                           "Expected notifyMotion() to have been called."));
+                                           "Expected notifyMotion() to have been called.",
+                                           waitUntil));
 }
 
 void TestInputListener::assertNotifyMotionWasCalled(
-        const ::testing::Matcher<NotifyMotionArgs>& matcher) {
+        const ::testing::Matcher<NotifyMotionArgs>& matcher, std::optional<TimePoint> waitUntil) {
     NotifyMotionArgs outEventArgs;
-    ASSERT_NO_FATAL_FAILURE(assertNotifyMotionWasCalled(&outEventArgs));
+    ASSERT_NO_FATAL_FAILURE(assertNotifyMotionWasCalled(&outEventArgs, waitUntil));
     ASSERT_THAT(outEventArgs, matcher);
 }
 
@@ -119,15 +121,18 @@
 }
 
 template <class NotifyArgsType>
-void TestInputListener::assertCalled(NotifyArgsType* outEventArgs, std::string message) {
+void TestInputListener::assertCalled(NotifyArgsType* outEventArgs, std::string message,
+                                     std::optional<TimePoint> waitUntil) {
     std::unique_lock<std::mutex> lock(mLock);
     base::ScopedLockAssertion assumeLocked(mLock);
 
     std::vector<NotifyArgsType>& queue = std::get<std::vector<NotifyArgsType>>(mQueues);
     if (queue.empty()) {
-        const bool eventReceived =
-                mCondition.wait_for(lock, mEventHappenedTimeout,
-                                    [&queue]() REQUIRES(mLock) { return !queue.empty(); });
+        const auto time =
+                waitUntil.value_or(std::chrono::system_clock::now() + mEventHappenedTimeout);
+        const bool eventReceived = mCondition.wait_until(lock, time, [&queue]() REQUIRES(mLock) {
+            return !queue.empty();
+        });
         if (!eventReceived) {
             FAIL() << "Timed out waiting for event: " << message.c_str();
         }
diff --git a/services/inputflinger/tests/TestInputListener.h b/services/inputflinger/tests/TestInputListener.h
index c53f8e0..9665f70 100644
--- a/services/inputflinger/tests/TestInputListener.h
+++ b/services/inputflinger/tests/TestInputListener.h
@@ -50,9 +50,11 @@
 
     void assertNotifyKeyWasNotCalled();
 
-    void assertNotifyMotionWasCalled(NotifyMotionArgs* outEventArgs = nullptr);
+    void assertNotifyMotionWasCalled(NotifyMotionArgs* outEventArgs = nullptr,
+                                     std::optional<TimePoint> waitUntil = {});
 
-    void assertNotifyMotionWasCalled(const ::testing::Matcher<NotifyMotionArgs>& matcher);
+    void assertNotifyMotionWasCalled(const ::testing::Matcher<NotifyMotionArgs>& matcher,
+                                     std::optional<TimePoint> waitUntil = {});
 
     void assertNotifyMotionWasNotCalled(std::optional<TimePoint> waitUntil = {});
 
@@ -65,7 +67,8 @@
 
 private:
     template <class NotifyArgsType>
-    void assertCalled(NotifyArgsType* outEventArgs, std::string message);
+    void assertCalled(NotifyArgsType* outEventArgs, std::string message,
+                      std::optional<TimePoint> waitUntil = {});
 
     template <class NotifyArgsType>
     void assertNotCalled(std::string message, std::optional<TimePoint> timeout = {});