This is a rather new laptop model, but most things actually work in Luddite.
Not the brightness interface though.

Try a newer kernel or could it be some firmware?

Looks light Windows even needed a brightness patch according to this Lenovo Link

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You might try the search links in thriftees signature for your issue.

Self Help

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Because I don't know.

If you don't find another way, you could install xbacklight and see if you can control your brightness using that tool. If you can, then you could map your brightness keys to xbacklight functions that would adjust your brightness up and down.

thanks. It works in Debian Testing but there the sound does not work. Which is also the case with Mageia 4.
In Xubunto 14.04 all hardware works. For some reason brightness interface does not work in Mint 17 - that one was a little strange.

So maybe back to xubuntu - I deleted it because Pulseaudio made problems when I tried to record streaming audio. Apparently this is being overly picky.

btw this machine is unusable in my view with windoze 8.1(ships with that) loaded with Lenovo bloatware because of the not so fast hdd --its not the fastest.
so that got deleted together with UEFI partitions rather quickly.

solution was xubuntu.. all hardware working out of the box