How to stop keyboard and sound indicator controlling both master and PCM volume

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http://ubuntuforums.org – How can I set the volume keys and sound indicator to change only the master volume? Now when i change the volume from 0 to 100%, using the keyboard or the sound indicator, first I change the PCM level (master remains at ~0%) and then the master level (PCM remains at ~80%) and then the PCM level again for a bit, resulting in a non linear volume increase. The issue apeared when I first installed Ubuntu 12.04 some time ago, I think. How can I set the PCM level and then adjust only the master volume? (Hardware)