I have a Lenovo G550 laptop with Ubuntu 12.10 installed and I have a problem with the Numpad/Num Lock behaviour (standard Hungarian layout). Sometimes when I press Home (key 7) it types 7 (or press End it types 1, etc.) so I need to press Num Lock to change the numpad status (for eg. to On or Off). But after a while I need to press Num Lock again cause Home key types 7 again. So regardless of the Num Lock status my keyboard sometimes behaves differently from time to time. What do I need to set to make the Num Lock behaviour constant?