Fixed bug 1859 - No SDL_VIDEORESIZE event generated when the window manager sets the window size. Samuel Hopkins Just confirming that the patch from Andreas (attachment 1715 [details]) works for me under SDL 2.0.3 with xmonad. Stas Sergeev Confirming that the patch in this ticket fixes the full-screen switching for dosemu2 on ubuntu-16.04. Note that I am not using xmonad, so this bug appears to be generic.
diff --git a/src/video/x11/SDL_x11framebuffer.c b/src/video/x11/SDL_x11framebuffer.c
index f51691d..afd1d51 100644
--- a/src/video/x11/SDL_x11framebuffer.c
+++ b/src/video/x11/SDL_x11framebuffer.c
@@ -97,7 +97,7 @@ X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format,
shm_error = False;
X_handler = X11_XSetErrorHandler(shm_errhandler);
X11_XShmAttach(display, shminfo);
- X11_XSync(display, True);
+ X11_XSync(display, False);
X11_XSetErrorHandler(X_handler);
if ( shm_error )
shmdt(shminfo->shmaddr);