Hello, I have Compaq Presario US2561. I am facing the same problem with the soundcard Acer - [ALi] M5451. However, I am just a beginner with Linux. I even have problems following up with all the suggestions on the message board and archives. For some reason my laptop cannot run 2.4.20-3-386, says system panic. So I am running 2.4.18-bf2.4. If you have any suggestions please reply. Any information will be highly appreciated. Thank you, Sudeep