diff --git a/reactos/drivers/wdm/audio/backpln/portcls/api.c b/reactos/drivers/wdm/audio/backpln/portcls/api.c
index 4ec0c121744..2c4f8955e9c 100644
--- a/reactos/drivers/wdm/audio/backpln/portcls/api.c
+++ b/reactos/drivers/wdm/audio/backpln/portcls/api.c
@@ -30,3 +30,46 @@ PcGetTimeInterval(
     return (CurrentTime.QuadPart - Since);
 }
 
+/*
+ * @unimplemented
+ */
+NTSTATUS NTAPI
+PcRegisterIoTimeout(
+    IN  PDEVICE_OBJECT pDeviceObject,
+    IN  PIO_TIMER_ROUTINE pTimerRoutine,
+    IN  PVOID pContext)
+{
+    NTSTATUS Status;
+
+
+    /* FIXME 
+     * check if timer is already used 
+     */
+
+    Status = IoInitializeTimer(pDeviceObject, pTimerRoutine, pContext);
+    if (!NT_SUCCESS(Status))
+    {
+        DPRINT("IoInitializeTimer failed with %x\n", Status);
+        return Status;
+    }
+
+    IoStartTimer(pDeviceObject);
+    return STATUS_SUCCESS;
+}
+
+/*
+ * @unimplemented
+ */
+NTSTATUS NTAPI
+PcUnregisterIoTimeout(
+    IN  PDEVICE_OBJECT pDeviceObject,
+    IN  PIO_TIMER_ROUTINE pTimerRoutine,
+    IN  PVOID pContext)
+{
+    /* FIXME 
+     * check if timer is already used 
+     */
+
+    IoStopTimer(pDeviceObject);
+    return STATUS_SUCCESS;
+}
diff --git a/reactos/drivers/wdm/audio/backpln/portcls/stubs.c b/reactos/drivers/wdm/audio/backpln/portcls/stubs.c
index f88a342bf4e..b3c377c5056 100644
--- a/reactos/drivers/wdm/audio/backpln/portcls/stubs.c
+++ b/reactos/drivers/wdm/audio/backpln/portcls/stubs.c
@@ -86,38 +86,6 @@ PcCompletePendingPropertyRequest(
     return STATUS_UNSUCCESSFUL;
 }
 
-
-/* ===============================================================
-    I/O Timeouts
-*/
-
-/*
- * @unimplemented
- */
-NTSTATUS NTAPI
-PcRegisterIoTimeout(
-    IN  PDEVICE_OBJECT pDeviceObject,
-    IN  PIO_TIMER_ROUTINE pTimerRoutine,
-    IN  PVOID pContext)
-{
-    UNIMPLEMENTED;
-    return STATUS_UNSUCCESSFUL;
-}
-
-/*
- * @unimplemented
- */
-NTSTATUS NTAPI
-PcUnregisterIoTimeout(
-    IN  PDEVICE_OBJECT pDeviceObject,
-    IN  PIO_TIMER_ROUTINE pTimerRoutine,
-    IN  PVOID pContext)
-{
-    UNIMPLEMENTED;
-    return STATUS_UNSUCCESSFUL;
-}
-
-
 /* ===============================================================
     Physical Connections
 */