Laravel is not receiving any $_GET variables from the URL query string. The $_GET and Input::all() are empty.
Example:
example.app/ex/
For me it worked only by changing try_files $uri $uri/ /index.php?$query_string; to try_files $uri $uri/ /index.php?$args inside location / block on ubuntu (14.04) nginx
try_files $uri $uri/ /index.php?$query_string;
try_files $uri $uri/ /index.php?$args
location /