I modified the script to mimic more the N9 behaviour and unlock with double click. So far I've been able to configure xbindkeys to detect double taps and run a script, to run xbindkeys when locked and kill it when unlocked, but when I do double tap on the "idle" screen nothing happens (xbindkeys does not notice any taps, I can see the verbose console output afterwards) does this happen because the screen is painted with the framebuffer? should xbindkeys register something? Of course I have included the above line in the script.