diff --git a/tests/qemu-iotests/199 b/tests/qemu-iotests/199
index dda918450a..dd6044768c 100755
--- a/tests/qemu-iotests/199
+++ b/tests/qemu-iotests/199
@@ -20,17 +20,43 @@
 
 import os
 import iotests
-import time
 from iotests import qemu_img
 
+debug = False
+
 disk_a = os.path.join(iotests.test_dir, 'disk_a')
 disk_b = os.path.join(iotests.test_dir, 'disk_b')
 size = '256G'
 fifo = os.path.join(iotests.test_dir, 'mig_fifo')
 
 
+def event_seconds(event):
+    return event['timestamp']['seconds'] + \
+        event['timestamp']['microseconds'] / 1000000.0
+
+
+def event_dist(e1, e2):
+    return event_seconds(e2) - event_seconds(e1)
+
+
 class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase):
     def tearDown(self):
+        if debug:
+            self.vm_a_events += self.vm_a.get_qmp_events()
+            self.vm_b_events += self.vm_b.get_qmp_events()
+            for e in self.vm_a_events:
+                e['vm'] = 'SRC'
+            for e in self.vm_b_events:
+                e['vm'] = 'DST'
+            events = (self.vm_a_events + self.vm_b_events)
+            events = [(e['timestamp']['seconds'],
+                       e['timestamp']['microseconds'],
+                       e['vm'],
+                       e['event'],
+                       e.get('data', '')) for e in events]
+            for e in sorted(events):
+                print('{}.{:06} {} {} {}'.format(*e))
+
         self.vm_a.shutdown()
         self.vm_b.shutdown()
         os.remove(disk_a)
@@ -47,6 +73,10 @@ class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase):
         self.vm_a.launch()
         self.vm_b.launch()
 
+        # collect received events for debug
+        self.vm_a_events = []
+        self.vm_b_events = []
+
     def test_postcopy(self):
         write_size = 0x40000000
         granularity = 512
@@ -77,15 +107,13 @@ class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase):
             self.vm_a.hmp_qemu_io('drive0', 'write %d %d' % (s, chunk))
             s += 0x10000
 
-        bitmaps_cap = {'capability': 'dirty-bitmaps', 'state': True}
-        events_cap = {'capability': 'events', 'state': True}
+        caps = [{'capability': 'dirty-bitmaps', 'state': True},
+                {'capability': 'events', 'state': True}]
 
-        result = self.vm_a.qmp('migrate-set-capabilities',
-                               capabilities=[bitmaps_cap, events_cap])
+        result = self.vm_a.qmp('migrate-set-capabilities', capabilities=caps)
         self.assert_qmp(result, 'return', {})
 
-        result = self.vm_b.qmp('migrate-set-capabilities',
-                               capabilities=[bitmaps_cap])
+        result = self.vm_b.qmp('migrate-set-capabilities', capabilities=caps)
         self.assert_qmp(result, 'return', {})
 
         result = self.vm_a.qmp('migrate', uri='exec:cat>' + fifo)
@@ -94,24 +122,38 @@ class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase):
         result = self.vm_a.qmp('migrate-start-postcopy')
         self.assert_qmp(result, 'return', {})
 
-        while True:
-            event = self.vm_a.event_wait('MIGRATION')
-            if event['data']['status'] == 'completed':
-                break
+        event_resume = self.vm_b.event_wait('RESUME')
+        self.vm_b_events.append(event_resume)
 
         s = 0x8000
         while s < write_size:
             self.vm_b.hmp_qemu_io('drive0', 'write %d %d' % (s, chunk))
             s += 0x10000
 
+        match = {'data': {'status': 'completed'}}
+        event_complete = self.vm_b.event_wait('MIGRATION', match=match)
+        self.vm_b_events.append(event_complete)
+
+        # take queued event, should already been happened
+        event_stop = self.vm_a.event_wait('STOP')
+        self.vm_a_events.append(event_stop)
+
+        downtime = event_dist(event_stop, event_resume)
+        postcopy_time = event_dist(event_resume, event_complete)
+
+        # TODO: assert downtime * 10 < postcopy_time
+        if debug:
+            print('downtime:', downtime)
+            print('postcopy_time:', postcopy_time)
+
+        # Assert that bitmap migration is finished (check that successor bitmap
+        # is removed)
         result = self.vm_b.qmp('query-block')
-        while len(result['return'][0]['dirty-bitmaps']) > 1:
-            time.sleep(2)
-            result = self.vm_b.qmp('query-block')
+        assert len(result['return'][0]['dirty-bitmaps']) == 1
 
+        # Check content of migrated (and updated by new writes) bitmap
         result = self.vm_b.qmp('x-debug-block-dirty-bitmap-sha256',
                                node='drive0', name='bitmap')
-
         self.assert_qmp(result, 'return/sha256', sha256)
 
 
