diff --git a/frontend/ui/uimanager.lua b/frontend/ui/uimanager.lua
index 507fe187a..41661bbb1 100644
--- a/frontend/ui/uimanager.lua
+++ b/frontend/ui/uimanager.lua
@@ -521,10 +521,8 @@ function UIManager:close(widget, refreshtype, refreshregion, refreshdither)
     end
 end
 
--- Schedule an execution task, task queue is in ascending order
+-- Schedule an execution task; task queue is in ascending order
 function UIManager:schedule(sched_time, action, ...)
-    logger.dbg("UIManager:schedule:", sched_time, action)
-    logger.dbg(debug.traceback())
     local p, s, e = 1, 1, #self._task_queue
     if e ~= 0 then
         -- Do a binary insert.
@@ -553,38 +551,13 @@ function UIManager:schedule(sched_time, action, ...)
         until e < s
     end
 
-    local level
-    -- Find the actual public cheduling function in the stack...
-    for l = 10, 2, -1 do
-        local info = debug.getinfo(l, "n")
-        if info then
-            if info.name == "scheduleIn" or info.name == "nextTick" or info.name == "tickAfterNext" then
-                level = l + 1
-                break
-            end
-        end
-    end
-
-    local caller
-    if level then
-        local info = debug.getinfo(level, "Sln")
-        caller = string.format("%s %s:%d declared line %d", info.name, info.source, info.currentline, info.linedefined)
-    else
-        caller = "N/A"
-    end
-
     table.insert(self._task_queue, p, {
         time = sched_time,
         action = action,
         argc = select('#', ...),
         args = {...},
-        source = caller,
     })
     self._task_queue_dirty = true
-    logger.dbg("UIManager:schedule: Inserted task", tostring(self._task_queue[p]), "at index", p, "of", #self._task_queue)
-    logger.dbg("\tsource =", self._task_queue[p].source or "nil")
-    logger.dbg("\taction =", self._task_queue[p].action or "nil")
-    logger.dbg("\ttime =", self._task_queue[p].time or "nil")
 end
 dbg:guard(UIManager, 'schedule',
     function(self, sched_time, action)
@@ -640,7 +613,7 @@ function UIManager:tickAfterNext(action, ...)
     -- c.f., http://lua-users.org/wiki/VarargTheSecondClassCitizen
     local n = select('#', ...)
     local va = {...}
-    -- We need to keep a reference to this anonymous function, as it is *NOT* quite `action`,
+    -- We need to keep a reference to this anonymous function, as it is *NOT* quite `action` yet,
     -- and the caller might want to unschedule it early...
     local delayed_action = function()
         self:nextTick(action, unpack(va, 1, n))
@@ -671,7 +644,6 @@ UIManager:scheduleIn(10.5, self.anonymousFunction)
 UIManager:unschedule(self.anonymousFunction)
 ]]
 function UIManager:unschedule(action)
-    logger.dbg("UIManager:unschedule:", tostring(action))
     local removed = false
     for i = #self._task_queue, 1, -1 do
         if self._task_queue[i].action == action then
@@ -679,7 +651,6 @@ function UIManager:unschedule(action)
             removed = true
         end
     end
-    logger.dbg(removed)
     return removed
 end
 dbg:guard(UIManager, 'unschedule',
@@ -1191,7 +1162,6 @@ end
 
 function UIManager:_checkTasks()
     self._now = time.now()
-    logger.dbg("UIManager:_checkTasks @", self._now)
     local wait_until = nil
 
     -- Tasks due for execution might themselves schedule more tasks (that might also be immediately due for execution ;)).
@@ -1199,12 +1169,7 @@ function UIManager:_checkTasks()
     self._task_queue_dirty = false
     while self._task_queue[1] do
         local task_time = self._task_queue[1].time
-        logger.dbg("UIManager:_checkTasks checking task", tostring(self._task_queue[1]))
-        logger.dbg("\tsource =", self._task_queue[1].source or "nil")
-        logger.dbg("\taction =", self._task_queue[1].action or "nil")
-        logger.dbg("\ttime =", self._task_queue[1].time or "nil")
         if task_time <= self._now then
-            logger.dbg("It's due, execute it")
             -- Pop the upcoming task, as it is due for execution...
             local task = table.remove(self._task_queue, 1)
             -- ...so do it now.