MBP 2016 video lags after connecting usb through AV Multiport Adapter

Discussion in 'MacBook Pro' started by Topper Harley, Feb 26, 2017.

  1. Topper Harley macrumors newbie

    Topper Harley

    Joined:
    Feb 26, 2017
    #1
    I've bought new MBP Pro 2016 and AV Multiport Adapter. Connected my monitor Dell U2713HM (1440p) using HDMI 1.4v - DVI cable. All was perfect until I have plugged mouse in USB port (also keyboard, iPhone, etc ) . On both screens started appear video lags: some areas with noised lines, lags on shut down and select user on login screen.

    What is this? Should I use another cable, maybe with HDMI 2.0 ?
     
  2. xraydoc macrumors 604

    xraydoc

    Joined:
    Oct 9, 2005
    Location:
    192.168.1.1
    #2
    May be running out of bandwidth on that single USB-C port. Try plugging the USB peripherals in to another port and see if that fixes the problem.
    I agree it shouldn't be a problem, but it's at least step 1 in the diagnosis.
     
  3. robvas macrumors 68030

    Joined:
    Mar 29, 2009
    Location:
    USA
    #3
    That's definitely not the issue, for two reasons.

    First, an iPhone, keyboard, and mouse aren't going to come anywhere near affecting the bandwidth of a USB-C port. Second, the HDMI connection uses 'alternate mode' where lines on the USB-C cable/connector are dedicated to the HDMI signal and won't be affected by any other traffic on the port.
     
  4. Topper Harley thread starter macrumors newbie

    Topper Harley

    Joined:
    Feb 26, 2017
    #4
    I have only AV Multiport Adapter to connect my USB devices.
    Maybe I should use USB-C - DisplayPort cable? Or problem, with my laptop?
     
  5. xraydoc macrumors 604

    xraydoc

    Joined:
    Oct 9, 2005
    Location:
    192.168.1.1
    #5
    I agree it shouldn't be the issue. There's virtually no data coming out of a mouse... But if the multiport adapter is misbehaving, this may help identify the problem. Anyway, just though it would be worth a try.
     

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