diff --git a/src/qt/CMakeLists.txt b/src/qt/CMakeLists.txt
index 032386152..4dd075e34 100644
--- a/src/qt/CMakeLists.txt
+++ b/src/qt/CMakeLists.txt
@@ -119,6 +119,7 @@ endif()
 if (UNIX AND NOT APPLE)
     find_package(X11 REQUIRED)
     target_link_libraries(ui PRIVATE X11::X11)
+
     find_package(ECM NO_MODULE)
     if (ECM_FOUND)
         list(APPEND CMAKE_MODULE_PATH ${ECM_MODULE_PATH})
diff --git a/src/qt/cpp11_thread.cpp b/src/qt/cpp11_thread.cpp
index 270832f10..96eb4a2e1 100644
--- a/src/qt/cpp11_thread.cpp
+++ b/src/qt/cpp11_thread.cpp
@@ -1,5 +1,4 @@
 #include <mutex>
-#include <atomic>
 #include <thread>
 #include <condition_variable>
 
@@ -9,7 +8,7 @@ struct event_cpp11_t
 {
     std::condition_variable cond;
     std::mutex mutex;
-    std::atomic_bool state = false;
+    bool state = false;
 };
 
 extern "C" {
@@ -89,7 +88,7 @@ thread_wait_event(event_t *handle, int timeout)
     auto lock = std::unique_lock<std::mutex>(event->mutex);
 
     if (timeout < 0) {
-        event->cond.wait(lock, [=] { return event->state.load(); });
+        event->cond.wait(lock, [event] { return event->state; });
     } else {
         auto to = std::chrono::system_clock::now() + std::chrono::milliseconds(timeout);
         std::cv_status status;
@@ -109,7 +108,10 @@ void
 thread_set_event(event_t *handle)
 {
     auto event = reinterpret_cast<event_cpp11_t*>(handle);
-    event->state = true;
+    {
+        auto lock = std::unique_lock<std::mutex>(event->mutex);
+        event->state = true;
+    }
     event->cond.notify_all();
 }
 
@@ -117,6 +119,7 @@ void
 thread_reset_event(event_t *handle)
 {
     auto event = reinterpret_cast<event_cpp11_t*>(handle);
+    auto lock = std::unique_lock<std::mutex>(event->mutex);
     event->state = false;
 }
 
diff --git a/src/qt/qt_gleswidget.cpp b/src/qt/qt_gleswidget.cpp
index 5bab0910d..2348dc27e 100644
--- a/src/qt/qt_gleswidget.cpp
+++ b/src/qt/qt_gleswidget.cpp
@@ -67,7 +67,7 @@ void GLESWidget::paintGL()
 {
     std::scoped_lock lock(image_mx);
     QPainter painter(this);
-    painter.drawImage(QRect(0, 0, width(), height()), m_image.convertToFormat(QImage::Format_RGBX8888), QRect(sx, sy, sw, sh));
+    painter.drawImage(QRect(0, 0, width(), height()), m_image, QRect(sx, sy, sw, sh));
 }
 
 void GLESWidget::mouseReleaseEvent(QMouseEvent *event)
@@ -141,12 +141,9 @@ void GLESWidget::qt_real_blit(int x, int y, int w, int h)
         sy = y;
         sw = this->w = w;
         sh = this->h = h;
-        static auto imagebits = m_image.bits();
-        for (int y1 = y; y1 < (y + h - 1); y1++)
-        {
-            auto scanline = imagebits + (y1 * (2048 + 64) * 4);
-            video_copy(scanline + (x * 4), &(buffer32->line[y1][x]), w * 4);
-        }
+        auto imagebits = m_image.bits();
+        video_copy(imagebits + y * ((2048 + 64) * 4) + x * 4, &(buffer32->line[y][x]), h * (2048 + 64) * sizeof(uint32_t));
+
         if (screenshots)
         {
             video_screenshot((uint32_t *)imagebits, 0, 0, 2048 + 64);