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 -- ---- Fred Smith -- fredex at fcshome.stoneham.ma.us ----------------------------- "Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of heaven, but only he who does the will of my Father who is in heaven." ------------------------------ Matthew 7:21 (niv) -----------------------------
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. -- john r pierce, recycling bits in santa cruz
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 Thursday, February 16, 2017 12:58 PM -0500 Jerry Geis <jerry.geis at gmail.com> wrote:> [495043.100076] usb 5-2: device descriptor read/64, error -71The 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. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
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. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20170217/d3aa96f6/attachment-0001.sig>