Odd USB 3.0 behaviour with hubs

Discussion in 'MacBook Pro' started by Moriarty, Jun 30, 2012.

  1. Moriarty macrumors 6502

    Feb 3, 2008
    My Retina Macbook Pro's behaviour with USB 3 devices is a bit confusing... I'm not sure if there's a software glitch, if something is wrong with my USB 3 hub, or if it's normal...

    So usually I have both USB 2 and USB 3 devices plugged into the ports on my 4-port USB 3 hub (all four ports are USB 3 on this hub). But if I restart my computer, any USB 3 devices revert back to USB 2 speed! :mad:

    Turns out that I must unplug any USB 2 devices, and only have USB 3 devices connected to the hub at first. Once the USB 3 hard drive is mounted, I can then plug USB 2 devices into the hub and everything is still at the proper speed.

    Any ideas on how to fix this? I just want my USB 3 devices to run at 3.0 speed when they're plugged into a 3.0 port. No hassles about plugging everything in in the right order! Thanks!
  2. Yawn66 macrumors member

    Jun 14, 2012
    This sounds very similar to a problem I was observing with USB 3 devices connected to USB 3 hubs with my 2012 11" MBA.


    In my case it definitely looked like a bug in Apple's USB 3 drivers. Maybe the updated released yesterday has helped?
  3. jeeve macrumors newbie

    Dec 24, 2008
    I've been having the exact-same issues and I found the solution:

    Use the 1st USB port for nothing but USB 3 Hubs and USB3 devices. IMPORTANT: the USB 3 hub(s) have to be USB 3 ONLY - NO USB 2 & 3 ports COMBINATION!

    Use the 2nd USB port for nothing but USB 2 Hubs and USB2 devices.

    Keeping them COMPLETELY separate works for me.
  4. nontroppo macrumors 6502


    Mar 11, 2009
  5. Yawn66 macrumors member

    Jun 14, 2012
  6. Orlandoech macrumors 68040


    Jun 2, 2011
    Salt Lake City, UT

    I have no issues with my USB3.0 or my USB3.0 Hub by IOGEAR. Maybe its the hub?

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