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Static buzz old-TV like noise with Ubuntu and an hub connected to a 2.1 audio system

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I would like to describe you a kind of mystic problem I am experiencing with my current setup.

I have a notebook connected to a WD black hub via a thunderbolt port. The hub powers the PC, and outputs to a 2.1 audio system and the video to an external monitor.

Basically, at random times, when I am listening to music and I'm using the 2.1 audio system, a loud static buzz noise starts to play. If I disconnect the audio cable from the HUB, the static noise stops and I can hear the music as usual from the laptop speaker, then if I connect it again to the 2.1 system it works well without buzz noise.

Again, randomly, this issue appears and I have to repeat this procedure.

I have not found this issue with Windows, just with Ubuntu.

Any help or hint is much appreciated

mangohost

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