When I plug in my device which is USB 2.0 into a 3.0 slot (cause that is all I have) [495042.943074] usb 5-2: new low-speed USB device number 6 using xhci_hcd [495043.100076] usb 5-2: device descriptor read/64, error -71
I receive the above error.
Is there a flag or setting that tells the USB to in a 2.0 mode ?
Thanks,
Jerry
On Thu, Feb 16, 2017 at 12:58:09PM -0500, Jerry Geis wrote:
When I plug in my device which is USB 2.0 into a 3.0 slot (cause that is all I have) [495042.943074] usb 5-2: new low-speed USB device number 6 using xhci_hcd [495043.100076] usb 5-2: device descriptor read/64, error -71
I receive the above error.
Is there a flag or setting that tells the USB to in a 2.0 mode ?
I'm no expert, and I don't know the answer, here is an idea: are you using a USB3 cable for this? If so, might it be worth trying a USB2 cable instead?
Also, are you sure that the device itself is working correctly? Try it on a different system on usb2 and usb3? try it on this same system in a usb2 port (temporarily, since you have no spare usb2 ports).
Fred
On 2/16/2017 9:58 AM, Jerry Geis wrote:
When I plug in my device which is USB 2.0 into a 3.0 slot (cause that is all I have) [495042.943074] usb 5-2: new low-speed USB device number 6 using xhci_hcd [495043.100076] usb 5-2: device descriptor read/64, error -71
I receive the above error.
Is there a flag or setting that tells the USB to in a 2.0 mode ?
USB 1 and 2 used 4 pins. USB 3 ports have an ADDITIONAL 5 pins, the original 4 are used for USB 1/2 operation, the new 5 only for USB 3 operation. they are effectively two completely independent controllers.
the combined protocol stack is an unholy mess of poorly planned extensions.
On 02/16/2017 12:28 PM, John R Pierce wrote:
USB 1 and 2 used 4 pins. USB 3 ports have an ADDITIONAL 5 pins, the original 4 are used for USB 1/2 operation, the new 5 only for USB 3 operation. they are effectively two completely independent controllers.
Do you mean USB type C? USB 3 is supported and most commonly uses type A plugs & ports, which should support older devices.
On 2/16/2017 1:12 PM, Gordon Messmer wrote:
On 02/16/2017 12:28 PM, John R Pierce wrote:
USB 1 and 2 used 4 pins. USB 3 ports have an ADDITIONAL 5 pins, the original 4 are used for USB 1/2 operation, the new 5 only for USB 3 operation. they are effectively two completely independent controllers.
Do you mean USB type C? USB 3 is supported and most commonly uses type A plugs & ports, which should support older devices.
look very closely at a USB 3.0 port, with the 'blue' tongued A connector, and you'll see 5 additional pins in there behind the standard USB1/2 4 pins.
https://files.cablewholesale.com/mailimages/usb-30-type-a-connector-det-smal... (male)
http://p.globalsources.com/IMAGES/PDT/BIG/663/B1079644663.jpg (female)
--On Thursday, February 16, 2017 12:58 PM -0500 Jerry Geis jerry.geis@gmail.com wrote:
[495043.100076] usb 5-2: device descriptor read/64, error -71
The USB driver uses negative values of the errors from /usr/include/asm-generic/errno.h. 71 is EPROTO, a protocol error.
Check the USB driver source code to see what would elicit this error.
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On 02/16/2017 11:58 AM, Jerry Geis wrote:
When I plug in my device which is USB 2.0 into a 3.0 slot (cause that is all I have) [495042.943074] usb 5-2: new low-speed USB device number 6 using xhci_hcd [495043.100076] usb 5-2: device descriptor read/64, error -71
I receive the above error.
Is there a flag or setting that tells the USB to in a 2.0 mode ?
You should be able to use USB2 devices in a USB3 port with no issues, as others have said, they use different pins and both are there.
I have never seen anyone have to do anything to use USB2 devices on a USB3 port except plug it in.
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Fred Smith -
Gordon Messmer -
Jerry Geis -
John R Pierce -
Johnny Hughes -
Kenneth Porter