I own the Lenovo Ideapad Y470 and I noticed that the FN keys stopped working/displaying when pressed. This happens when I press the the FN arrows and FN F1 keys. I update the Nvidia drivers regularly and this was only a recent occurrence.
As Fn keys work with installation of Lenovo Energy Managment which has hotkey bundled inside, thus it would be good if you can give this software a check.
Thus, one of the things you can do to try to address this issue is to reinstall this software.
To do so, go to the following links:For Windows 7, http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS027354
For Windows 8, http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS030850
Click on Download Now and an .exe file will be downloaded onto your system. Save/Run it.
Restart your system.
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