Parameter not taken into account on a specific link structure

[OndanomalA]

I have WP installed on my VPS (with nginx 1.3.12 and php5-fpm 5.4.11).

The first page of search results (/?s=test) is loaded properly, but
/page/2/?s=test displays the same content of /page/2/ (so ?s=test isn't
taken into account).

It's probably something wrong with my nginx config:

location ~ \.php$ {
    try_files $uri =404;
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    include /etc/nginx/fastcgi.conf;
    fastcgi_pass unix:/var/run/php5-fpm.sock;
}

location / {
# if you're just using wordpress and don't want extra rewrites
# then replace the word @rewrites with /index.php
 try_files $uri $uri/ /index.php;

}

Articles work fine anyway.. the permalink structure
(/%year%/%monthnum%/%day%/%postname%/) works fine.. so I should find a fix
that doesn't break that (but "fixes" the search parameter problem).

"DEMO"
Page 1 (/?s=test): http://goo.gl/HigKa
Page 2 (/page/2/?s=test): http://goo.gl/ujftR


Thanks in advance.
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