diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/AuthRippleController.kt b/packages/SystemUI/src/com/android/systemui/biometrics/AuthRippleController.kt
index 39291ed..4fee083 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/AuthRippleController.kt
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/AuthRippleController.kt
@@ -23,7 +23,6 @@
 import android.graphics.Point
 import android.hardware.biometrics.BiometricFingerprintConstants
 import android.hardware.biometrics.BiometricSourceType
-import android.util.Log
 import androidx.annotation.VisibleForTesting
 import com.android.keyguard.KeyguardUpdateMonitor
 import com.android.keyguard.KeyguardUpdateMonitorCallback
@@ -95,7 +94,6 @@
     public override fun onViewAttached() {
         authController.addCallback(authControllerCallback)
         updateRippleColor()
-        updateSensorLocation()
         updateUdfpsDependentParams()
         udfpsController?.addCallback(udfpsControllerCallback)
         configurationController.addCallback(configurationChangedListener)
@@ -237,7 +235,11 @@
     }
 
     private fun showDwellRipple() {
-        mView.startDwellRipple(statusBarStateController.isDozing)
+        updateSensorLocation()
+        fingerprintSensorLocation?.let {
+            mView.setFingerprintSensorLocation(it, udfpsRadius)
+            mView.startDwellRipple(statusBarStateController.isDozing)
+        }
     }
 
     private val keyguardUpdateMonitorCallback =
@@ -291,13 +293,6 @@
     private val udfpsControllerCallback =
         object : UdfpsController.Callback {
             override fun onFingerDown() {
-                if (fingerprintSensorLocation == null) {
-                    Log.e("AuthRipple", "fingerprintSensorLocation=null onFingerDown. " +
-                            "Skip showing dwell ripple")
-                    return
-                }
-
-                mView.setFingerprintSensorLocation(fingerprintSensorLocation!!, udfpsRadius)
                 showDwellRipple()
             }
 
@@ -310,12 +305,10 @@
         object : AuthController.Callback {
             override fun onAllAuthenticatorsRegistered() {
                 updateUdfpsDependentParams()
-                updateSensorLocation()
             }
 
             override fun onUdfpsLocationChanged() {
                 updateUdfpsDependentParams()
-                updateSensorLocation()
             }
         }
 
@@ -345,13 +338,11 @@
                                 "\n\tudfpsRadius=$udfpsRadius")
                     }
                     "fingerprint" -> {
-                        updateSensorLocation()
                         pw.println("fingerprint ripple sensorLocation=$fingerprintSensorLocation")
                         showUnlockRipple(BiometricSourceType.FINGERPRINT)
                     }
                     "face" -> {
                         // note: only shows when about to proceed to the home screen
-                        updateSensorLocation()
                         pw.println("face ripple sensorLocation=$faceSensorLocation")
                         showUnlockRipple(BiometricSourceType.FACE)
                     }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/biometrics/AuthRippleControllerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/biometrics/AuthRippleControllerTest.kt
index 44ef922..37bb0c2 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/biometrics/AuthRippleControllerTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/biometrics/AuthRippleControllerTest.kt
@@ -18,6 +18,7 @@
 
 import android.graphics.Point
 import android.hardware.biometrics.BiometricSourceType
+import android.hardware.fingerprint.FingerprintSensorPropertiesInternal
 import android.testing.AndroidTestingRunner
 import android.testing.TestableLooper.RunWithLooper
 import androidx.test.filters.SmallTest
@@ -76,6 +77,7 @@
     @Mock private lateinit var udfpsController: UdfpsController
     @Mock private lateinit var statusBarStateController: StatusBarStateController
     @Mock private lateinit var lightRevealScrim: LightRevealScrim
+    @Mock private lateinit var fpSensorProp: FingerprintSensorPropertiesInternal
 
     @Before
     fun setUp() {
@@ -86,6 +88,7 @@
                 .startMocking()
 
         `when`(RotationUtils.getRotation(context)).thenReturn(RotationUtils.ROTATION_NONE)
+        `when`(authController.udfpsProps).thenReturn(listOf(fpSensorProp))
         `when`(udfpsControllerProvider.get()).thenReturn(udfpsController)
 
         controller = AuthRippleController(
@@ -132,7 +135,7 @@
             false /* isStrongBiometric */)
 
         // THEN update sensor location and show ripple
-        verify(rippleView).setFingerprintSensorLocation(fpsLocation, -1f)
+        verify(rippleView).setFingerprintSensorLocation(fpsLocation, 0f)
         verify(rippleView).startUnlockedRipple(any())
     }
 
@@ -155,7 +158,7 @@
                 false /* isStrongBiometric */)
 
         // THEN update sensor location and show ripple
-        verify(rippleView).setFingerprintSensorLocation(fpsLocation, -1f)
+        verify(rippleView).setFingerprintSensorLocation(fpsLocation, 0f)
         verify(rippleView).startUnlockedRipple(any())
     }
 
@@ -342,4 +345,23 @@
         captor.value.onUiModeChanged()
         verify(rippleView).setLockScreenColor(ArgumentMatchers.anyInt())
     }
+
+    @Test
+    fun testUdfps_onFingerDown_showDwellRipple() {
+        // GIVEN view is already attached
+        controller.onViewAttached()
+        val captor = ArgumentCaptor.forClass(UdfpsController.Callback::class.java)
+        verify(udfpsController).addCallback(captor.capture())
+
+        // GIVEN fp is updated to Point(5, 5)
+        val fpsLocation = Point(5, 5)
+        `when`(authController.fingerprintSensorLocation).thenReturn(fpsLocation)
+
+        // WHEN finger is down
+        captor.value.onFingerDown()
+
+        // THEN update sensor location and show ripple
+        verify(rippleView).setFingerprintSensorLocation(fpsLocation, 0f)
+        verify(rippleView).startDwellRipple(false)
+    }
 }