Dell XPS 9560 - strange electrical noises from thunderbolt/usb port

Discussion in 'Dell' started by Epanastasis, Oct 22, 2017.

  1. Epanastasis

    Epanastasis Newbie

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    I have noticed some strange electrical interference noises emanating from my unit when using docks (and a mouse connected to the dock).

    I have two set-ups, my home and my work set-up. At work, I use a TB16, with all peripherals connected to the dock, and only the thunderbolt usb-c cable connected to the XPS. Whenever I use the mouse scroll, I can hear these weird electrical interference noises that coincide perfectly with the scroll function.

    At home, I use a USB 3.1 Dock, with keyboard + mouse plugged into that, and a monitor connected to the XPS via DisplayPort -> usb-c adapter. I get exactly the same thing with that set up.

    Any ideas what is causing this? Is it cause for concern?
     
  2. don_svetlio

    don_svetlio Notebook Virtuoso

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    Probably coil whine - if the machine functions normally, I'd just ignore it.
     
  3. Epanastasis

    Epanastasis Newbie

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    Cool, thanks for the reply! Wasn't sure if cause for concern or not.
     
  4. anytimer

    anytimer Notebook Deity

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    Do you get the same thing with the mouse plugged directly into the laptop?
     
  5. Epanastasis

    Epanastasis Newbie

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    Oddly no - just if I have multiple peripherals plugged in via a hub.
     
  6. anytimer

    anytimer Notebook Deity

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    1. Is the sound still there if you turn off the speakers? Sometimes a poor design will inject noise into the audio path.

    2. Is there an option to power the dock externally? If so, do you still get the noise if the dock is powered externally, not drawing power from the laptop?
     
  7. Epanastasis

    Epanastasis Newbie

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    1. Sound is there independent of speakers

    2. Both docks are powered externally already

    It also seems to get louder the longer I'm using mouse/keyboard... If I come back to the machine after a while away, it takes a few scrolls to get the sound to return.
     
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