[Nut-upsuser] Tripp-Lite SMART1000LCD usbhid failed to claim USB device

Charles Lepple clepple at gmail.com
Mon Feb 14 13:58:33 UTC 2011

On Feb 14, 2011, at 12:05 AM, Rory Jaffe wrote:

> I used the package that Ubuntu 10.10 provides. Here's the package  
> info:
> rory at ubuntunas:~$ apt-cache showpkg nut
> Package: nut
> Versions:
> 2.4.3-1ubuntu5 (/var/lib/apt/lists/ 
> us.archive.ubuntu.com_ubuntu_dists_maverick_main_binary- 
> amd64_Packages) (/var/lib/dpkg/status)

Ah, I think I see the problem. We added the USB IDs for the (new)  
SMART1000LCD to usbhid-ups after NUT 2.4.3 was released.

You should be able to get basic functionality by adding the following  
two lines to the middle of /lib/udev/rules.d/52-nut-usbups.rules:

#  e.g. TrippLite Smart1000LCD  - usbhid-ups
ATTR{idVendor}=="09ae", ATTR{idProduct}=="2009", MODE="664",  

Note that you will need to replace the @RUN_AS_GROUP@ with the actual  
group that appears on the other lines in that file. It's probably  
"nut" or "ups", but I haven't tried 10.10 yet.

The easiest way to get udev to reload this is to unplug the USB cable  
of the UPS, and plug it back in.

It does appear that the reported battery voltage might be off by a  
factor of 10. That should already be fixed in NUT 2.6.0 and later. The  
"low battery" signal is generated internally by the UPS, and should  
not be affected.

Feel free to post the output of "upsc" once the driver starts.


> On Sun, Feb 13, 2011 at 8:56 PM, Charles Lepple <clepple at gmail.com>  
> wrote:
>> On Feb 13, 2011, at 8:32 PM, Rory Jaffe wrote:
>>> Trying to get a Tripp-Lite to work with nut--Ubuntu 10.10. I was  
>>> getting the error message "unable to claim USB device", tried to  
>>> unbind the drivers to that device, and had the following  
>>> delightful experience. In short, continue to get the same problem,  
>>> and the drivers bound themselves back.
>> The usbhid-ups driver should unbind the kernel HID interface as  
>> necessary, but it needs write permission to the /dev/bus/usb/* node  
>> which corresponds to the UPS.
>> Which version of NUT is this? Is it the set of .debs from Ubuntu,  
>> and if so, what is the full version printed by dpkg/synaptic/ 
>> aptitude?
>> If it is built from source, what options did you pass to the  
>> configure script?
Charles Lepple

A: Because it messes up the order in which people normally read text.
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