[Nut-upsuser] USB problems

Charles Lepple clepple at gmail.com
Tue May 11 03:25:54 UTC 2010

On Mon, May 10, 2010 at 11:02 PM, James <bjlockie at lockie.ca> wrote:
>  On 05/10/10 22:09, Charles Lepple wrote:
>> On Mon, May 10, 2010 at 8:35 PM, James<bjlockie at lockie.ca>  wrote:
>>>   0.000663     failed to claim USB device: could not claim interface 0:
>>> Operation not permitted
>>>   0.000671     failed to detach kernel driver from USB device: could not
>>> detach kernel driver from interface 0: Operation not permitted
>> This error is different ("operation not permitted" versus "Device or
>> resource busy"). Is your source build using a different user than the
>> Gentoo build? (Some distributions have a specific NUT userid instead
>> of using "nobody" - not sure how they do it in Gentoo).
> I'm compiling it with root but I followed the instructions (I think):
> ./configure --with-user=ups --with-group=nut
> What user should perform the #8 step, /usr/local/ups/bin/upsdrvctl start

You can run upsdrvctl as root, and the driver will change to the user
you listed above. If you change the parameters to ./configure, you
will need to run "make clean" before "make all" and/or "make install"

The key is to make sure that the installed udev files match that
username as well. (At the beginning of this thread, you quoted a udev
rule which set the USB device node to user "nobody", which probably
isn't in group "nut".)

- Charles Lepple

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