do you mean you can't get it to work as a cache drive? it should be very nearly transparent, if you turn caching / readyboost? off then it might show up as a device, it might be normal not to show up otherwise.
I have the same problem, initially, at factory settings, you are able to see the ssd cache drive, but after updating windows, on my y410p laptop, the 24gb ssd is not visible anymore, not even in the intel rst menu (empty internal port 4 comes up), and it cannot be found anywhere, not even in device manager, the only thing I can actually see it in is Seatools. I asked lenovo, but all they said is that they couldn;t do anything and they told me to reset my computer back to its factory setting through the recovery softwre.
I have the Lenovo Y410p and have the same issue. I only looked into it because bootup time was so bad, and after removing the SSD from the laptop, boot up time was much faster. However, I would like to have the drive installed and utilized properly. The system does not recognize the drive at all. I even removed every other piece of hardware, and still couldnt see it. I tried reformat, refresh, reinstall, driver settings, cache settings, read tons of forums, nothing..
Any other ideas?