[F11] sound mutes at 50%

[Zacharie Elcor]

hi,

I have a sound problem since I installed F11 : if I lower volume below 50%,
no more sound (and 50% is too high).
I tried gnome-volume-control, pavucontrol, alsamixer and they all have the
same behavior.

I don't know much about sound hardware but here is dmidecode output :

On Board Device Information
    Type: Sound
    Status: Enabled
    Description: Sigmatel 9200

any clue, command or idea ?
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