I have read here on this being a issue. I have tried about 4 things with no success so I am posting this!
I have the HP Envy beats Edition 14- 2166se Laptop running fully updated Win 8.1 and using The audio driver sp63555.
Everything works including the beats audio program just can not get the fn - b button combo to active or deactive the beats audio function controler. Any help would be great!!!