I've tested the 2.6.34-rc6 kernel and it fixes the issue completely!!! Thanks!!!
You can easily download and install it from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.34-rc6-lucid/
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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[Karmic & Lucid Beta 1] Brightness fn keys lost functionality (Lenovo laptops)
https://bugs.launchpad.net/bugs/406515
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