Horde lockfile is always empty

[B. Buehler]

Hi

i'm testing kolab 2.2.rc1 on openSuSE 10.3. 

My setup of Horde:

$conf['log']['priority'] = PEAR_LOG_DEBUG;
$conf['log']['ident'] = 'HORDE';
$conf['log']['params'] = array();
$conf['log']['name'] = '/usr2/logs/horde.log';
$conf['log']['params']['append'] = true;
$conf['log']['type'] = 'file';
$conf['log']['enabled'] = true;
$conf['log_accesskeys'] = false;

The lockfile horde.log is always empty.

What can i do?

Thanks

Bernhard