We already know that the brightnessup/down keys don't actually work on
your laptop model, that's a separate bug in the kernel, and already
reported.

What's important here is that keymap -i shows the right key symbol for
every key. I. e. with the original udev-extras, are you saying that when
you press brightness down/up, zoom, and suspend keys, it shows the
_wrong_ key name in keymap -i? Do they show the correct key name after
you did your udev rule modifications and added the new module-sony-fz
file? Please note that this file will be applied to the "Sony Vaio Keys"
module (input/event4).

The actual reaction to a keypress is done by gnome-power-manager, for
brightness. It receives the keys, and tells the kernel (via hal or
devkit-power) to set a different brightness level. Due to the missing
kernel support, this won't work. However, other keys such as volume
up/down, suspend, or switch videomode should all work.

-- 
Fn keys on vaio vgn-fz21e
https://bugs.launchpad.net/bugs/384863
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