My 4,1>5,1 with Sierra: USB hubs no longer work?

Discussion in 'Mac Pro' started by zephonic, Jun 14, 2017.

  1. zephonic macrumors 65816

    zephonic

    Joined:
    Feb 7, 2011
    Location:
    greater L.A. area
    #1
    Weird stuff, my (bus-powered) USB hubs worked fine with all previous iterations of OSX, but I installed Sierra a few days ago, and now they either work poorly or not at all. I contacted Apple support but that didn't get me very far.

    Anybody else experience this? What gives?
     
  2. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #2
    Hub is plugged into third party card or directly to built-in ports?

    Did you change anything else, or just upgrade to Sierra? For example if you plugged in a power hungry drive around the same time it could exceed what the bus-powered port can provide.
     
  3. zephonic thread starter macrumors 65816

    zephonic

    Joined:
    Feb 7, 2011
    Location:
    greater L.A. area
    #3
    Two hubs, one plugged directly into one of the front ports, the other via an extension cord into one of the back ports. Both work fine on Mountain Lion, Mavericks, and El Cap. With Sierra, nothing.

    Weirdest thing, I have a brand new USB 3.0 hub and that works fine with the extension cord.

    I believe I read somewhere that Sierra manages the bus power more aggressively, but I can't remember where?
     
  4. DPUser macrumors 6502a

    Joined:
    Jan 17, 2012
    #4
    Strange. No such issue here. Multiple USB hubs of various vintages.
     
  5. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #5
    Possible powe issue. I only use self powered hub, no problem at all.
     

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