I am using a Lenovo 3000 N100 and have both Windows XP and Ubuntu 11.10 installed. No sound is comming from the speakers or the headphones. In Windows XP the audio control icon is also not visible. In Ubuntu the audio controls are visible and working but still no sound. When I check the click the audio hardware tab it shows something like 'Dummy stereo...'.
Could anyone tell me what the exact problem is.