Hi, 
I resolved everything. 
The problem for me was the dist-upgrade only. 
The kernel 3.8.0-19 amd64 works perfectly on a fresh install.
I reinstalled it when I found a very strange think: nvidia didn't work well 
with optimus, intel hd 4000 was unstable, and many strange things.
So I tried reinstalling everything from a fresh install and began an odissey: I 
think the problem was efi not really cleaned, so after the first fresh install 
the system booted from 3.8.0 kernel but when i was in the system, typing uname 
-a, showed me 3.5.0-17 (the 12.10 kernel that was installed before 
do-release-upgrade).
So I deleted and format / partition, removed everything from 
/boot/efi/EFI/ubuntu, reset windows efi (I had a backup of clean winzoz 7 
install because I have dual boot) and performed a new fresh install.
Now everything works fine, all keys  working except fn+f2 (wireless switch), 
but I extremely better than before.
The very strange think was the behaviour of the first fresh install, never seen 
a system completely crazy, I installed a kernel and found another, I think the 
problem was the efi.

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https://bugs.launchpad.net/bugs/1173107

Title:
  Asus N56VZ fn Keys.

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