Sound controller doesn't work properly

I have a strange problem with my sound card, I'm able to play Audio CDs but not any other form of music (MP3,OGG..), I'm also able to hear my vocie amplified when I'm using the mic. When I try play some Mp3 I only hear a msec of the song a short pause and another msec, then a long pause (like 30 sec) and then the it restart (ms-shortpause-ms-longpause-ms-shortpause-ms-longpause-ms-shortpause-ms-longpause....). I really can't understand what's going on. Suse 10.0 install it as a sound controller (snd-intel8x0, or something like that) , and the manual identify it as a AC'97 sound card. Under windows and if I boot using a Knoppix Cd it works porperly. My laptop is a Fujitsu SIEMENS Amilo A1640 Can anyone help me? Thanks -- Maurizio