config_mixer of /etc/grml/autoconfig.functions fails on quite a lot of IBM 
systems with "amixer: Unable to find simple control 'PCM',0", so the mixer 
volumes aren't adjusted as wanted.

The attached mixer script addresses this issue, gets rid of aumix, doesn't use 
fix_ibm_sound() any longer and also addresses systems with several soundcard 
devices.

Works fine on several of my test systems, though I'd highly welcome any 
feedback from testers before integrating it into mainline grml-autoconfig.