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20561Re: USB3 and Back Compatibility

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  • alx_mtc
    Jun 3, 2013
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      Disabling XHCI simply disables the USB3.0 support.
      You will get only USB2.0 ports.
      You can probably check this with a high speed USB3 hard drive, comparing the transfer speed.

      Alessio


      --- In perseus_SDR@yahoogroups.com, ken-long@... wrote:
      >
      > I have been able to get USB 3 to work with the Perseus on a couple of Win 8 Asus laptops by changing a bios setting.
      > One of these machines only has USB 3 ports.
      >
      >
      >
      > Before I did this only HF Span would work correctly. After the change the 4.0c worked properly. I do not know what bios
      > settings others will have available but I would suggest some experimentation in the USB bios settings if you do not have the
      > same settings available to you as on my machines. How you access the bios is machine and sometimes operating system specific
      > so if you do not know how to do this already you will have to do some research. For most Win 8 machines you can get to the
      > bios through advanced start-up. Google how to access the bios for your machine should get you all the info you need.
      >
      >
      > When you get to the USB configuration in the Bios change XHCI Pre-Boot Mode from Auto to Disabled. Save the change and exit the bios utility.
      > This was all I did to get the Perseus up and going with 4.0C on USB 3.0.
      >
      >
      > I hope this helps.
      >
      >
      > Ken, N0QO
      >
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