3 files changed, 19 insertions, 2 deletions
diff --git a/src/plugins/platforms/xcb/qxcbclipboard.cpp b/src/plugins/platforms/xcb/qxcbclipboard.cpp
index bc92f82d5f..ac8b029916 100644
--- a/src/plugins/platforms/xcb/qxcbclipboard.cpp
+++ b/src/plugins/platforms/xcb/qxcbclipboard.cpp
@@ -810,8 +810,9 @@ xcb_generic_event_t *QXcbClipboard::waitForClipboardEvent(xcb_window_t window, i
 
         connection()->flush();
 
-        // sleep 50 ms, so we don't use up CPU cycles all the time.
-        QThread::msleep(50);
+        const auto elapsed = timer.elapsed();
+        if (elapsed < clipboard_timeout)
+            queue->waitForNewEvents(clipboard_timeout - elapsed);
     } while (timer.elapsed() < clipboard_timeout);
 
     return nullptr;
diff --git a/src/plugins/platforms/xcb/qxcbeventqueue.cpp b/src/plugins/platforms/xcb/qxcbeventqueue.cpp
index f6158d3127..acec0486c2 100644
--- a/src/plugins/platforms/xcb/qxcbeventqueue.cpp
+++ b/src/plugins/platforms/xcb/qxcbeventqueue.cpp
@@ -229,6 +229,8 @@ void QXcbEventQueue::run()
         enqueueEvent(event);
         while (!m_closeConnectionDetected && (event = xcb_poll_for_queued_event(connection)))
             enqueueEvent(event);
+
+        m_newEventsCondition.wakeOne();
         wakeUpDispatcher();
     }
 
@@ -346,6 +348,13 @@ bool QXcbEventQueue::peekEventQueue(PeekerCallback peeker, void *peekerData,
     return result;
 }
 
+void QXcbEventQueue::waitForNewEvents(unsigned long time)
+{
+    m_newEventsMutex.lock();
+    m_newEventsCondition.wait(&m_newEventsMutex, time);
+    m_newEventsMutex.unlock();
+}
+
 void QXcbEventQueue::sendCloseConnectionEvent() const
 {
     // A hack to close XCB connection. Apparently XCB does not have any APIs for this?
diff --git a/src/plugins/platforms/xcb/qxcbeventqueue.h b/src/plugins/platforms/xcb/qxcbeventqueue.h
index 235f2824be..11d0b8e963 100644
--- a/src/plugins/platforms/xcb/qxcbeventqueue.h
+++ b/src/plugins/platforms/xcb/qxcbeventqueue.h
@@ -43,6 +43,8 @@
 #include <QtCore/QHash>
 #include <QtCore/QEventLoop>
 #include <QtCore/QVector>
+#include <QtCore/QMutex>
+#include <QtCore/QWaitCondition>
 
 #include <xcb/xcb.h>
 
@@ -104,6 +106,8 @@ public:
     bool peekEventQueue(PeekerCallback peeker, void *peekerData = nullptr,
                         PeekOptions option = PeekDefault, qint32 peekerId = -1);
 
+    void waitForNewEvents(unsigned long time = ULONG_MAX);
+
 private:
     QXcbEventNode *qXcbEventNodeFactory(xcb_generic_event_t *event);
     void dequeueNode();
@@ -131,6 +135,9 @@ private:
 
     // debug stats
     quint64 m_nodesOnHeap = 0;
+
+    QMutex m_newEventsMutex;
+    QWaitCondition m_newEventsCondition;
 };
 
 template<typename Peeker>