diff --git a/bumblebee/engine.py b/bumblebee/engine.py
index fb6a7d3..f441269 100644
--- a/bumblebee/engine.py
+++ b/bumblebee/engine.py
@@ -269,8 +269,10 @@ class Engine(object):
         interval = float(self._config.get("interval", 1))
         while self.running():
             if event and time.time() - last_full < interval:
+                log.debug("partial output update ({} {} {})".format(event, time.time(), last_full))
                 self.patch_output(event)
             else:
+                log.debug("full update: {} {} ({})".format(time.time(), last_full, time.time() - last_full))
                 last_full = time.time()
                 self.write_output()
             if self.running():
diff --git a/bumblebee/input.py b/bumblebee/input.py
index 9b760bc..77c0693 100644
--- a/bumblebee/input.py
+++ b/bumblebee/input.py
@@ -90,6 +90,7 @@ class I3BarInput(object):
     def wait(self, timeout):
         self._condition.wait(timeout)
         rv = self.event if self.has_event else None
+        log.debug("received input event: {}".format(rv))
         self.has_event = False
         return rv