[ubuntu] NEC FM500CE - can not adjust the volume with Fn keys

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http://ubuntuforums.org – Hi, I can not adjust the volume using Fn+F3/F4 keys. When I press it once (for example Fn+F4 in order to increase the volume) it goes slowly all the way till the end (highest volume) and balloon notification blinks as if I was still pressing the button. The same with decreasing the volume. Brightness control works as it should. My system is updated Ubuntu 9.10 (Hardware)