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gigabyte ga-78lmt-usb3 won't recognize usb 3.0 ports as 2.0 in XP

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  • Motherboards
  • USB3
  • Gigabyte
  • Windows XP
Last response: in Motherboards
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May 22, 2014 8:36:16 PM

I have a pre-built computer with a gigabyte ga-78lmt-usb3 motherboard. After installing Windows XP, the USB 2.0 ports work fine, but I can't get the 3.0 ports to work as 2.0 ports. I've tried to uninstall and reinstall drivers, disable the USB ports, turn OFF USB 3.0 in the bios--but nothing is working. I still have a yellow question mark in the device manager. I found some info online that said to have the xHCI Mode set to Auto or Smart Auto in the BIOS, but there is no xHCI mode anywhere in my BIOS from what I can see. Any suggestions would be greatly appreciated. Thanks.

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a c 168 V Motherboard
May 23, 2014 12:00:14 AM

"but I can't get the 3.0 ports to work as 2.0 ports"
That's a rather strange way of saying you've got a problem with your USB 3.0 ports.

Windows XP does not support USB 3.0 natively.
The computer manufacturer may have the required driver on it's website, otherwise you need a newer OS.
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May 23, 2014 6:37:56 AM

Hey, Phillip. Actually, I'm not looking for it to support 3.0 because I know it doesn't. But it's supposed to treat 3.0 ports as 2.0 ports according to everything I've read, and it's not doing that either. I'm using this computer specifically with Windows XP as a gaming machine as everything I have runs best on XP.

Phillip Corcoran said:
"but I can't get the 3.0 ports to work as 2.0 ports"
That's a rather strange way of saying you've got a problem with your USB 3.0 ports.

Windows XP does not support USB 3.0 natively.
The computer manufacturer may have the required driver on it's website, otherwise you need a newer OS.


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June 18, 2014 3:55:10 PM

I am having the exact same problem but with windows 7 x64.

Did you manage to find a solution?
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June 28, 2014 11:00:19 PM

Kaneda Beats said:
I am having the exact same problem but with windows 7 x64.

Did you manage to find a solution?


No. I never did find a solution, so I just completely disabled them in the BIOS. But shouldn't they function properly with Windows 7? I thought XP was the oldest system that didn't support 3.0.
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