I have a dual-boot installation: OpenSuSE 13.2 & Linux Mint 17.1 on Asus k55vd, both 64-bit. I am running a 3.14 kernel on Linux Mint and 3.16 on OpenSuSE.
I had encountered that kernels above 3.14 have problem with function keys. The brightness + and - function keys do not work The rest all are working (sound +/-, sleep, mute, lock touch).
I had this problem on all distributions I tried (Ubuntu, Fedora, OpenSuSE) having kernel 3.14 or above.
So how to resolve this? Do not recommend downgrade my kernel.