Mixer failure

Hi all, I just managed to install my soundcard... So thanks a lot for your helps. But now I have another problem: when launching KDE, I have an error message Mixer failure kmix: Could not open mixer. Perhaps you have no mermission to access the mixer device. Login as root and do a 'chmod a+rw /dev/mixer*' to allow the access. That's pretty fun, because it says it to me even when I AM connected as root... So I think that the problem is anything else that a permission problem...:) Anybody can help me? Romain