--- src/backends/x11/meta-renderer-x11.c	2019-03-11 16:01:02.000000000 -0700
+++ src/backends/x11/meta-renderer-x11.c	2019-03-11 23:44:53.274968331 -0700
@@ -85,14 +85,6 @@
   cogl_xlib_renderer_set_foreign_display (cogl_renderer, xdisplay);
   cogl_xlib_renderer_request_reset_on_video_memory_purge (cogl_renderer, TRUE);
 
-  /* Set up things so that if the INTEL_swap_event extension is not present,
-   * but the driver is known to have good thread support, we use an extra
-   * thread and call glXWaitVideoSync() in the thread. This allows idles
-   * to work properly, even when Mutter is constantly redrawing new frames;
-   * otherwise, without INTEL_swap_event, we'll just block in glXSwapBuffers().
-   */
-  cogl_xlib_renderer_set_threaded_swap_wait_enabled (cogl_renderer, TRUE);
-
   return cogl_renderer;
 }