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Every time I boot Debian, the boot log shows a bunch of xhci_hcd problems, and messages like

usb 3-13: hub failed to enable device, error -22
usb 3-13: device descriptor read/8, error -61

I'm having a hard time finding out what these error codes actually mean, though. Is there anywhere that lists what all of these error codes mean?

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  • Hmmm....you'll probably end up looking at the driver source code for the definitive answer.
    – mdpc
    Commented Mar 19, 2015 at 18:30

3 Answers 3

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The errno program (part of the moreutils package) translates error numbers to the corresponding name:

    $ errno 61
    ENODATA 61 No data available
5

The first one is EINVAL (a standard POSIX C error) inverted. If you are curious it's from line 4218 in [src]/drivers/usb/core/hub.c (v. 3.19):

4217     if (udev->state != USB_STATE_DEFAULT)
4218         return -EINVAL;

The other one is from the hub_port_init() function in the same file.

These kinds of error messages aren't really intended to provide more information to end users than what's there ("hub failed to enable device"), however. They're used in debugging, possibly including if you were to file a bug report.

If you were hoping for documentation that will explain the problem in detail I think you are out of luck. Part of the reason for this is perhaps that there may not be any more accurate, detailed explanation that can be provided. Some things can fail the same way with a range of indeterminate potential causes.

4

The origin of the error code can be found in the source code for the hub in question.

e.g. grep -A 1 -m 1 22 /usr/src/linux-source-4.3/drivers/usb/host/xhci.h

#define PORT_PLC        (1 << 22)
/* port configure error change - port failed to configure its link partner */

You'll find the meaning of some error codes in /usr/src/linux-source-$yourKernel/Documentation/usb/error-codes.txt

e.g.

-EINVAL         a) Invalid transfer type specified (or not supported)
                b) Invalid or unsupported periodic transfer interval
                c) ISO: attempted to change transfer interval
                d) ISO: number_of_packets is < 0
                e) various other cases

And also ISO madness, if this happens: Log off and go home


For the 61 error: /usr/src/linux-headers-4.3.0-0.bpo.1-common/include/uapi/asm-generic/errno.h

#define ENODATA         61      /* No data available */
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  • 1
    please provide a link to the sources.
    – not2qubit
    Commented Jul 3, 2017 at 6:05
  • 1
    @not2qubit Alternative to online links, you can search your computer by like locate command (you need to build db in advance for doing that).
    – IsaacS
    Commented Aug 24, 2017 at 18:30

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