the use of fn-keys on vaio models depends on the module "sony-laptop" 
previously named "sonypi".
so first, verify that the module is correctly loaded.
"lsmod | grep -i sony"
then, the link beetween the fn-keys module and traditionnal keycodes are made 
through HAL (Hardware Abstraction Layer ). If something goes wrong there, xev 
and the traditionnal programs for keybiddings debug won't work.
I think your bug lies there.

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Fn keys on VAIO don't produce keystrokes nor ACPI events
https://bugs.launchpad.net/bugs/251665
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