I've installed xdebug by dotdeb and I want to change value of remote_log but no chance.

I've tried add xdebug.remote_log = "/path/to/log" to /etc/php5/fpm/php.ini
and php_admin_value[xdebug.remote_log] = "/path/to/log" to /etc/php5/fpm/pool.d/www.conf

when I add xdebug.remote_log = "/path/to/log" to /etc/php5/mods-available/xdebug.ini it works.

On the other hand all other settings can be changed in pool configuration such as idekey, trace_output_dir, profiler_output_dir etc.