I got a brand-new Samsung series 9 (exact reference is: NP940X5J-K02US). Because of this question, mentioning it required at least a kernel 3.15, I waited a couple of weeks for Ubuntu 14.10 to be released.
The touchpad works out of the box, except that it does not respond at all after a suspend. I have no idea how I can investigate any further.
Does anyone knows how to fix it, or at least how to provide the community with more information about the problem? I could leave with executing a command every time after a suspend.