I've managed to make the issue disappear!
I've deleted from /home folder the .pulse folder.
It seems that in that folder I had some "processes", or something like this, so
quickly born and killed that I couldn't seen in the task manager and because of
this the CPU was at 50% and maybe this was influencing also the polkitd
service.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Incomplete => Fix Committed
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The system is very slow. The memory is not freed after closing a program. (-pae)
https://bugs.launchpad.net/bugs/569711
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