[Nut-upsuser] need help [usb_submit_urb; Linux kernel]

[Charles Lepple]

Note: the NUT list email address is "nut-upsuser@" - the "nut-upsuser-owner@" address only goes to the list owners.

On Jul 10, 2015, at 7:52 AM, taoufik abidi <ing.abidi at gmail.com> wrote:

> hi,
> I got stuck on this error I am researching to solve the problem but I found nothing
> Here the error "drivers / hid / usbhid / hid-core.c usb_submit_urb (ctrl) failed"
> the problem generated when I connect the UPS to the server via the USB cable.

hid-core.c is part of the Linux kernel, not NUT. You may have better luck asking on the linux-usb mailing list, but they will want to know the version of the kernel that you are using, and the exact output dmesg.

Sometimes, this error/warning is generated when the kernel requests extra identification from the UPS. It is most likely benign, unless there is a disconnection message like the following:

[    3.618015] usb 4-2: can't set config #1, error -84
[    4.056102] usb 4-2: USB disconnect, device number 3

If the UPS logically disconnects, it will make it harder for user-space software like NUT to reliably communicate with it.

-- 
Charles Lepple
clepple at gmail