Workaround: If you have Intel graphics you should be able to use the
"xbacklight" command.  Should also work with the open-source nvidia
drivers as well.  (src: https://wiki.ubuntu.com/Halsectomy)

BTW: I too get nothing with kemap -i for the two brightness keys on my
Lenovo G530.  Other Fn keys output known codes.

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