diff --git a/src/core/LockSurface.cpp b/src/core/LockSurface.cpp
index 9ab54ae..0edbea6 100644
--- a/src/core/LockSurface.cpp
+++ b/src/core/LockSurface.cpp
@@ -105,6 +105,13 @@ void CSessionLockSurface::configure(const Vector2D& size_, uint32_t serial_) {
             readyForFrame = false;
             return;
         }
+
+        // Disable vsync throttling so eglSwapBuffers never blocks waiting for
+        // wl_buffer.release. Without this, a DPMS-off monitor can stall the main
+        // thread indefinitely because the compositor never releases the buffer.
+        // Rendering rate is already governed by wl_surface.frame callbacks.
+        g_pEGL->makeCurrent(eglSurface);
+        eglSwapInterval(g_pEGL->eglDisplay, 0);
     }
 
     if (readyForFrame && !(SAMESIZE && SAMESCALE)) {