[ubuntu] Numpad arrow keys interfering with character input

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http://ubuntuforums.org – Brief: Numpad arrow keys interfering with the character input preventing character input on alphabetic keypad. I have Acer Aspire 5600 laptop and Ubuntu 11.10 I have numpad combined with the alphabetic keypad. When I am typing letters where numpad is situated arrow keys are navigating. I can't get no characters. Cant turn it off. Not by pressing numlock. Occurs only when typing with second and third keyboard layout. I have English, Ukrainian and Russian. When changing their order in keyboard preferences only the first works ok. What is the issue? (Hardware)