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[Software] USB--log error -71

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pholt
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[Software] USB--log error -71

#1 Post by pholt »

I'm running Debian 11 headless on a Lenovo m910q--no GUI, text only. I've started seeing spurious USB errors in my log. Here's a sample:

9:21 AM usb 1-8: device descriptor read/all, error -71
9:18 AM usb 1-8: device not accepting address 62, error -71
9:10 AM usb 1-8: device not accepting address 56, error -71
7:33 AM usb 1-8: device not accepting address 40, error -71
6:18 AM usb usb1-port8: Cannot enable. Maybe the USB cable is bad?

The only usb devices that are attached are a backup USB drive and a DAC, but both are at different addresses and are functioning fine. Bluetooth is disabled (don't need it). It appears that the kernel is generating the error based on something it perceives in the USB hub because "usb 1-8" doesn't exist as an attached device. I'm stumped. There are some comments about this on other forums, but they are unhelpful.

Ideas? Suggestions? Guidance? Thank you!

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Re: [Software] USB--log error -71

#2 Post by kent_dorfman766 »

most likely the attached USB disk is flaking out.

do lsusb to try to see where port 1-8 is. also look for device added/removed messages in dmesg output since those should most likely occur in conjuction with the descriptor errors above.

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Re: [Software] USB--log error -71

#3 Post by p.H »

Some internal devices may be connected via USB, such as memory card readers. Or it could be a faulty USB port.

pholt
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Re: [Software] USB--log error -71

#4 Post by pholt »

Okay--checking the dmesg output was useful because it shows the sequence of failures. Here's an example:

[176598.220256] usb 1-8: new high-speed USB device number 63 using xhci_hcd
[176598.368531] usb 1-8: New USB device found, idVendor=0424, idProduct=2412, bcdDevice= b.b2
[176598.368540] usb 1-8: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[176598.369953] hub 1-8:1.0: USB hub found
[176598.370011] hub 1-8:1.0: 1 port detected
[176652.696004] usb 1-8: USB disconnect, device number 63
[176654.084684] usb usb1-port8: Cannot enable. Maybe the USB cable is bad?

The only devices connected to the external USB ports on the system are a DAC (always on) and a USB disk drive (always on). What I can't figure out is if the failure is because the hub chip (Microchip Technology, Inc.) is failing or of the kernel is generating the errors while it probes for what's available. As far as internal devices go, there are two SSD drives--a startup volume and a storage volume. I don't know if there's a WiFi adapter in there, but it would be disabled. A nightly backup runs to the external drive, and it has been functioning with no issue for a couple of years.

There is a DisplayPort output connected to a dummy HDMI plug so the machine can run fully headless (which allows me to do remote management with Mesh Commander). Is it possible that Linux is barfing up the messages because the dummy plug spoofs the hardware but not the kernel? And finally, this behavior only began about a month ago, so it's never been an issue before.

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