I have debian wheezy installed on my new laptop (Toshiba Satellite L70), with Kernel 3.14 from backports.
After I resume from suspend, all function keys (F1 - F12) behaviour is inverted, for example, instead of Alt+F4 to close a window, I have to press Alt+Fn+F4. Function keys alone perform special operations (volume up/down, brightness, etc.).
A restart brings things back to normal.