Pinucset, you might take a look at bug #35319.
To put in a nutshell :
_ For Vaio FS Series it's possible to make it work
_ For Vaio FE Series that's impossible without seriously patching sonypi module
I don't have technical experience to do that though....
And finally consider using smartdimmer to be able to control brightness
Hopes it helps you
** Changed in: Ubuntu
Status: Unconfirmed => Confirmed
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FN keys of Sony Vaio doesn't work
https://launchpad.net/bugs/50607
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