display_errors and error_reporting not enough?

[Argon <argon@xxxxxx>]

Hi;
I want to enable error messages while I'm testing or developing.
I use php 5.2.4 on ubuntu server.
These two lines does only print notices.

<?php
   ini_set('display_errors', 1);
   error_reporting(E_ALL);
?>

When I make something wrong like syntax error; I get blank pages.
Is there something else which I don't know?
Here is the phpinfo();
http://77.79.86.103/phpinfo.php
Googling brings only these two and variations of error_reporting parameters.

-- 

cat