diff -up install/update_0723_078.php.cron install/update_0723_078.php
--- install/update_0723_078.php.cron	2010-06-15 19:21:06.749549193 +0200
+++ install/update_0723_078.php	2010-06-15 19:23:32.651892513 +0200
@@ -2097,6 +2097,9 @@ function update0723to078($output='HTML')
          ('Ticket','alertnotclosed','43200',NULL,'1','1','3','0','24','30',NULL,NULL,NULL)";
       $DB->query($query) or die("0.78 populate glpi_crontasks" . $LANG['update'][90] . $DB->error());
 
+      // RPM provides a good system cron
+      $query = "UPDATE `glpi_crontasks` SET `mode`=2 WHERE `mode`=1";
+      $DB->query($query) or die("0.78 update glpi_crontasks (for RPM)" . $LANG['update'][90] . $DB->error());
    }
    $ADDTODISPLAYPREF['Crontask']=array(8,3,4,7);
 
--- install/mysql/glpi-0.78.2-empty.sql.cron	2010-11-15 18:57:02.766598708 +0100
+++ install/mysql/glpi-0.78.2-empty.sql	2010-11-15 18:57:44.406719150 +0100
@@ -910,6 +910,8 @@
 INSERT INTO `glpi_crontasks` VALUES ('14','ReservationItem','reservation','3600',NULL,'1','1','3','0','24','30',NULL,NULL,NULL);
 INSERT INTO `glpi_crontasks` VALUES ('15','Ticket','closeticket','43200',NULL,'1','1','3','0','24','30',NULL,NULL,NULL);
 INSERT INTO `glpi_crontasks` VALUES ('16','Ticket','alertnotclosed','43200',NULL,'1','1','3','0','24','30',NULL,NULL,NULL);
+### RPM provides a good system cron
+UPDATE `glpi_crontasks` SET `mode`=2 WHERE `mode`=1;
 
 ### Dump table glpi_devicecases