[Nut-upsuser] USB device descriptor read error with Eaton 5E UPS

[Leith Bade]

Hi,

I recently purchased a new Easton 5E UPS. I plugged the USB cable into
my computer so I could use the NUT UPS tools. However every so often
NUT fails to connect to the device after a boot.

Looking at dmesg I see errors like this:
[    3.277075] usb 1-9: new low-speed USB device number 6 using xhci_hcd
[    3.302091] usb 1-9: device descriptor read/8, error -32
[    3.430241] usb 1-9: device descriptor read/8, error -32
[    3.653526] usb 1-9: new low-speed USB device number 7 using xhci_hcd
[    3.678473] usb 1-9: device descriptor read/8, error -32
[    3.824288] usb 1-9: device descriptor read/8, error -32
[    4.045977] usb 1-9: new low-speed USB device number 8 using xhci_hcd
[    4.071018] usb 1-9: device descriptor read/8, error -32
[    4.199046] usb 1-9: device descriptor read/8, error -32
[    4.422439] usb 1-9: new low-speed USB device number 9 using xhci_hcd
[    4.451464] usb 1-9: device descriptor read/8, error -32
[    4.579618] usb 1-9: device descriptor read/8, error -32

I have tried to plug it into every USB port (including the USB 3.0
ones) and I still get these errors. I discovered that power cycling
the UPS will fix it for a while, and also unplugging and replugging
the USB cable will also fix it sometimes.

I have observed the problem on both an Asus P9D-I motherboard with the
Intel C222 chipset and on the Asus H87M-E motherboard with the Intel
H87 chipset.

I emailed Eaton support but they don't know what the issue is. They
want me to confirm that it is not Linux or PC issue before I return it
for testing under warranty.

They also said that all warranty testing is performed under Windows only :-(.

How can I be sure that this is a problem with the device and not my
computer before I return it?

I am on Ubuntu Server 14.04 x86-64 bit. The kernel version is:
Linux version 3.13.0-32-generic (buildd at kissel) (gcc version 4.8.2
(Ubuntu 4.8.2-19ubuntu1) ) #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014
(Ubuntu 3.13.0-2.57-generic 3.13.11.4)