I have had this problem for a while, nothing recognizes my soundcard, I have had sound in here at one point and now it is 'poof' gone...if someone could help that'd be great.
closed as off topic by Marco Ceppi♦ Feb 1 '12 at 17:10
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The following instructions for installing the latest ALSA packages via the DKMS .deb installer worked for me on the Acer 5520.
They solved my microphone problems, but they may also save other sounds problems...