First check what version of the sound card you have in your dell:

# grep ‘Codec’ /proc/asound/card0/codec#*

the command should return with “Codec: SigmaTel STAC9227″. If that’s the case add this line to your /etc/modprobe.d/alsa-base file:

options snd-hda-intel model=dell-3stack

and reboot.

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