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[xubuntu] Loud hissing/interference when audio is playing

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http://ubuntuforums.org – Good afternoon, I updated my Xubuntu HTPC installation yesterday. and ever since have had an issue with interference whenever audio is playing. The audio/video can still be heard (albeit very quietly), with incredibly loud interference (much like you might hear with a badly tuned analog TV) over the top of it. I currently have my system set up with Pulseaudio, providing analog 5.1, and before yesterday, this was all working fine (apart from the front left channel. This is probably unrelated, but I thought it might be worth mentioning). There are also two (unused) audio devices, an HDA In (Hardware)