I found a workaround here:
http://bbs.archlinux.org/viewtopic.php?id=73889

I can change the brightness with setpci -s 00:02.0 F4.B=FF where FF is a
brightest mode and 00:02.0 is from lspci | grep VGA.

Now I can set the brightness using setpci, how can I make acpi to use
this command?

-- 
[Karmic] Brightness fn keys lost functionality (multiple laptops)
https://bugs.launchpad.net/bugs/406515
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