diff --git a/artiq/dashboard/moninj.py b/artiq/dashboard/moninj.py
index fdcf7bb63..ac49619ac 100644
--- a/artiq/dashboard/moninj.py
+++ b/artiq/dashboard/moninj.py
@@ -487,12 +487,10 @@ class _DeviceManager:
         self.handlers_by_uid = dict()
 
         self.dds_sysclk = 0
-        self.ttl_cb = lambda: None
         self.ttl_handlers = dict()
-        self.dds_cb = lambda: None
         self.dds_handlers = dict()
-        self.dac_cb = lambda: None
         self.dac_handlers = dict()
+        self.channels_cb = lambda: None
 
     def init_ddb(self, ddb):
         self.ddb = ddb
@@ -513,17 +511,14 @@ class _DeviceManager:
                 self.setup_ttl_monitoring(False, handler.channel)
                 handler.delete_widget()
                 del self.ttl_handlers[handler.channel]
-                self.ttl_cb()
             elif isinstance(handler, _DDSHandler):
                 self.setup_dds_monitoring(False, handler.bus_channel, handler.channel)
                 handler.delete_widget()
                 del self.dds_handlers[(handler.bus_channel, handler.channel)]
-                self.dds_cb()
             elif isinstance(handler, _DACHandler):
                 self.setup_dac_monitoring(False, handler.spi_channel, handler.channel)
                 handler.delete_widget()
                 del self.dac_handlers[(handler.spi_channel, handler.channel)]
-                self.dac_cb()
             else:
                 raise ValueError
 
@@ -536,19 +531,19 @@ class _DeviceManager:
 
             if isinstance(handler, _TTLHandler):
                 self.ttl_handlers[handler.channel] = handler
-                self.ttl_cb()
                 self.setup_ttl_monitoring(True, handler.channel)
             elif isinstance(handler, _DDSHandler):
                 self.dds_handlers[(handler.bus_channel, handler.channel)] = handler
-                self.dds_cb()
                 self.setup_dds_monitoring(True, handler.bus_channel, handler.channel)
             elif isinstance(handler, _DACHandler):
                 self.dac_handlers[(handler.spi_channel, handler.channel)] = handler
-                self.dac_cb()
                 self.setup_dac_monitoring(True, handler.spi_channel, handler.channel)
             else:
                 raise ValueError
 
+        if self.description != description:
+            self.channels_cb()
+
         self.description = description
 
     def ttl_set_mode(self, channel, mode):
@@ -811,14 +806,10 @@ class _MonInjDock(QtWidgets.QDockWidget):
 
 class MonInj:
     def __init__(self, schedule_ctl):
-        self.ttl_dock = _MonInjDock("TTL")
-        self.dds_dock = _MonInjDock("DDS")
-        self.dac_dock = _MonInjDock("DAC")
+        self.dock = _MonInjDock("MonInj")
 
         self.dm = _DeviceManager(schedule_ctl)
-        self.dm.ttl_cb = lambda: self.ttl_dock.layout_widgets(self.dm.ttl_handlers.values())
-        self.dm.dds_cb = lambda: self.dds_dock.layout_widgets(self.dm.dds_handlers.values())
-        self.dm.dac_cb = lambda: self.dac_dock.layout_widgets(self.dm.dac_handlers.values())
+        self.dm.channels_cb = lambda: self.dock.layout_widgets(self.dm.handlers_by_uid.values())
 
     async def stop(self):
         if self.dm is not None:
diff --git a/artiq/frontend/artiq_dashboard.py b/artiq/frontend/artiq_dashboard.py
index 634f5e29d..1e95def0b 100755
--- a/artiq/frontend/artiq_dashboard.py
+++ b/artiq/frontend/artiq_dashboard.py
@@ -261,8 +261,8 @@ def main():
     # lay out docks
     right_docks = [
         d_explorer, d_shortcuts,
-        d_ttl_dds.ttl_dock, d_ttl_dds.dds_dock, d_ttl_dds.dac_dock,
-        d_datasets, d_applets, d_waveform, d_interactive_args
+        d_ttl_dds.dock, d_datasets, d_applets,
+        d_waveform, d_interactive_args
     ]
     main_window.addDockWidget(QtCore.Qt.RightDockWidgetArea, right_docks[0])
     for d1, d2 in zip(right_docks, right_docks[1:]):
@@ -280,8 +280,7 @@ def main():
     atexit_register_coroutine(smgr.stop, loop=loop)
 
     # work around for https://github.com/m-labs/artiq/issues/1307
-    d_ttl_dds.ttl_dock.show()
-    d_ttl_dds.dds_dock.show()
+    d_ttl_dds.dock.show()
 
     # create first log dock if not already in state
     d_log0 = logmgr.first_log_dock()