Open the php file in your browser. You should see cpu info. If not remove some functions from for example the webapps ini file.
system,exec,popen and proc_open
If you remove them from this ini file:
Code:
/usr/local/phpXX/lib/php.conf.d/50-webapps.ini
(where phpXX is your php version)
Restart/reload your webserver. Check in browser sys file again. If it works this is your problem.
Then just do the following to customize your disable list to make it work: