I've been having a bunch of trouble with the USB ports on my desktop, in particular the webcam doesn't work and there are lots of errors in the output of "lsusb -v" when I try to debug.  (I get the "can't get device qualifier: Resource temporarily unavailable" errors, whether the webcam is plugged in or not, which seems to eliminate the webcam itself as the source of the problem)

On the positive side, a usb keyboard, mouse and USB sticks seem to work ok. The hardware is a Supermicro SuperWorkstation 7037A-i, with an X9dai motherboard.

I assumed the problem was hardware related and raised a ticket with supermicro. They asked me to test the machine using a supported OS, and the nearest to fedora-27 was CentOS 6.2 (compatibility matrix). So today I booted into Centos-6.2. To my surprise there were no errors in the "lsusb -v" output, no errors in dmesg or syslog, and the webcam worked fine.

This seems to suggest it's not a hardware problem, but some difference in the drivers. I am pretty sure the usb/webcam used to work, but that's going back a few versions of fedora, and probably 3/4 years.

Various debugging output;

dmidecode

dmesg

lsmod

lsusb -v

dmesg output

dmidecode

lsmod

Plugging in the webcam produces this;

...