Source of the patch: http://patch-tracker.debian.org/patch/series/view/xdg-utils/1.1.0~rc1+git20111210-6/xdg-screensaver-new-gnome.diff
---
 scripts/xdg-screensaver.in |   56 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 48 insertions(+), 8 deletions(-)

--- a/scripts/xdg-screensaver.in
+++ b/scripts/xdg-screensaver.in
@@ -435,14 +435,54 @@ screensaver_gnome_screensaver()
 # http://people.gnome.org/~mccann/gnome-screensaver/docs/gnome-screensaver.html
     case "$1" in
         suspend)
-        screensaver_suspend_loop \
-        dbus-send --session \
-                  --dest=org.gnome.ScreenSaver \
-                  --type=method_call \
-                  /org/gnome/ScreenSaver \
-                  org.gnome.ScreenSaver.SimulateUserActivity \
-                  2> /dev/null
-        result=$?
+        perl -e '
+use strict;
+use warnings;
+use IO::File;
+use Net::DBus;
+use X11::Protocol;
+
+my ($window_id, $screensaver_file) = @ARGV;
+
+# Find window name to pass to session manager.
+my $x = X11::Protocol->new();
+my $named_window_id = hex($window_id);
+my $window_name;
+while (1) {
+  ($window_name) = $x->GetProperty($named_window_id, $x->atom("WM_NAME"),
+				   $x->atom("STRING"), 0, 1000, 0);
+  last if defined($window_name) && $window_name ne "";
+  (undef, $named_window_id) = $x->QueryTree($named_window_id);
+  if (!defined($named_window_id)) {
+    $window_name = "?";
+    last;
+  }
+}
+
+# Inhibit idle detection (flags = 8) with window name and ID.
+# We have no reason so just send the window name again.
+my $bus = Net::DBus->session();
+my $sm_svc = $bus->get_service("org.gnome.SessionManager");
+my $sm = $sm_svc->get_object("/org/gnome/SessionManager",
+			     "org.gnome.SessionManager");
+$sm->Inhibit($window_name, hex($window_id), $window_name, 8);
+
+# Wait until removed from the status file.
+while (1) {
+  sleep(10);
+  my $status = new IO::File($screensaver_file, "r")
+    or exit 0;
+  my $found;
+  while (<$status>) {
+    if (/^$window_id:/) {
+      $found = 1;
+      last;
+    }
+  }
+  exit 0 unless $found;
+}
+' $window_id $screensaver_file &
+        result=0
         ;;
 
         resume)