It is almost certainly this: http://www.intel.com/content/www/us/en/io/universal-serial-bus/usb3-frequency-interference-paper.html
On Thu, Dec 4, 2014 at 4:18 PM, Soeren Zorn <[email protected]> wrote: > Hi, > > I encountered a small issue with the USB ports. I am running the latest > Debian testing version on my MinnowboardMax (dual core version, Rev.A2), > with LXDE as GUI. So far so good. Input device is a Logitech K400 keyboard > connected by using a Logitech Unifying receiver. > > Now about my problem - when I connect an external USB 3.0 hard drive to > the USB3.0 port (the lower, blue USB port) with the Unifiying-Receiver > connected to the upper USB2.0 port, the keyboard becomes somewhat > unresponsive - meaning, I type on the keyboard, and sometimes a letter > shows up, but most times not. Same for the keypad input - if I am lucky, > the cursor moves, but most of the times, it simply does not. > > Now comes the funny thing - when I connect the hard drive to the USB2.0 > port (top), and the unifying receiver to the lower USB3.0 port, everything > works like a charm, besides the fact that the disk transfer speed is > limited to USB2.0. > > Any ideas what goes wrong? Anything I might have done wrong? I am thankful > for any suggestions! > > Soeren > > > -- > ...and thanks for all the fish (in memory of D. N. Adams) > _______________________________________________ > elinux-MinnowBoard mailing list > [email protected] > http://lists.elinux.org/mailman/listinfo/elinux-minnowboard >
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