i found the problem but, i don't know how solve.

When I move volume slider, or press volume buttons on my computer, i see in 
alsamixer 3 bars  "master", "PCM" and "LFE".
Starting from zero volume, first PCM and LFE has volume grows, and then when 
they are full (100) then "master" starts to grow.

How "master" has zero volume at the first time (of total volume), i have
no sound with low volume settings ( < 20%)

How i can solve this?.

I attach some images with examples.


** Attachment added: "alsamixer_zero_volume.png"
   http://launchpadlibrarian.net/34918757/alsamixer_zero_volume.png

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no sound testing
https://bugs.launchpad.net/bugs/454065
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