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.
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