If I try to change the volume in a pulsevolume changer (kmix or the
ubuntu thing) the sounds jumps always to 100% in PCM. Master and LFE do
not change.

The LFE output is on the hardware side the subwoofer 
PCM is the real Master
Master is only the normal sound speaker

this is some sort of problem between alsa and pulseaudio but the two
projects will not fix it upstream because alsa said its a pulseaudio
problem and pulse, its an alsa one (if i can find the bugreports again i
will add them)

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https://bugs.launchpad.net/bugs/899899

Title:
  Pulseaudio only to loud or mute on inspiron 9400

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