I found kind off answer on another forum here
I solved this problem by opening
bootmisc.sh in etc/init.d with kedit while working as root
and add at the end off the file


# alsa working after new startup
cd /etc/init.d
./alsa-autoconfig


So after this it should be working every startup, Important make a enter after last sentence.
Sometimes for example when I want to play a soundfile or record sound with audacity I get
messages like; can't play back or dev/dsp can't opening device
This can be solved by opening configurationcenter sound and media soundsystem
and not let aRTs-soundserver start at startup KDE
I cannnot still let it work all together, I post this because maybe others can use it.
I am using Knoppix 3.2 from may (Dutch version) and still not so familiar with Linux,
maybe with newer version off Knoppix it is already solved.