[ubuntu] Microphone feedback

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http://ubuntuforums.org – Hi everyone. I have a laptop that dual boots Windows 7 and Ubuntu. I use Skype in both operating systems. In Windows, it works fine, but in Linux, there are problems with feedback when I'm talking to others. My mic doesn't seem to cancel out feedback and I'm thinking it's a problem with the sound driver. Is this a known problem in Ubuntu? (Hardware)