I think the following patch fixes the problem in the xserver.
diff -u xorg-server-1.5.2/dix/window.c xorg-server-1.5.2/dix/window.c
--- xorg-server-1.5.2/dix/window.c
+++ xorg-server-1.5.2/dix/window.c
@@ -3259,6 +3258,8 @@
SendVisibilityNotify(WindowPtr pWin)
{
xEvent event;
+ if (!MapUnmapEventsEnabled(pWin))
+ return;
#ifndef NO_XINERAMA_PORT
unsigned int visibility = pWin->visibility;
#endif
--
Screensaver doesn't start
https://bugs.launchpad.net/bugs/278112
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