Xev doesnt necessarily pick up keypresses from the acpi keys. it aren't
keys but acpi events after all, which are then converted to keypresses
by the acpi event system. Nevertheless, the brightness keys should work
fine without it, since they are managed in hardware (they work outside
the OS too) and the keypresses are just to let your desktop know that
you've been changing it, so it can give feedback to you about the
status. You could see if the key does anything at all by running 'sudo
acpi_listen' and see if it gives output for your key. It should give the
following output:

hotkey ATKD 0000002e 00000003
hotkey ATKD 0000002d 00000002
hotkey ATKD 0000002c 00000001
hotkey ATKD 0000002b 00000001
hotkey ATKD 0000001c 00000001
hotkey ATKD 0000001d 00000001
hotkey ATKD 0000001e 00000002
hotkey ATKD 0000001f 00000008

This was from turning the brightness on my A6K down by 4 (Fn+F5), and up
by 4 (Fn+F6) (ignore the 4th value, its just a number that goes up when
you generate the same event again). If your output is different, post it
here and i can probably give you instructions to fix it. If your Fn+F6
does not generate events, it may be physically broken.

Also, as a temporary workaround, you can try to adjust the brightness with:
sudo echo "X" > /proc/acpi/asus/brn
where X is a number between 0 (dark) and 15 (bright).

-- 
[gutsy] some asus hotkeys no longer work
https://bugs.launchpad.net/bugs/124736
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Bugs, which is the bug contact for Ubuntu.

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