I have the same problem with my samsung n150.
Is there any possibility to solve our problem?
Same problem for me running version 188.8.131.52.7.2230 (184.108.40.2060) for Windows* 7 32 Bit.
Downgraded the driver to this version: version 220.127.116.11.1.1972 (18.104.22.1682) for Windows* 7.
Fn buttons now working as they originally did. Must have been a recent auto update.