Nut upsuser - Jun 2011 - Belkin F6C1200-UNV on Ubuntu 11.04

Hello, all,

I had been using NUT's Ubuntu package (64 bit) with no problems until
upgrading to Ubuntu 11.04.  Now, I get the following message when I try
usbhid-ups:

$ sudo /lib/nut/usbhid-ups -a mybelkin
Network UPS Tools - Generic HID driver 0.35 (2.6.0)
USB communication driver 0.31
Can't claim USB device [050d:1100]: could not detach kernel driver from
interface 0: Operation not permitted

ups.conf:
[mybelkin]
    driver = usbhid-ups
    port = auto
    desc = "Belkin 1200 VA UPS"

The udev rule seems OK:
#  F6C1100-UNV, F6C1200-UNV  - usbhid-ups
ATTR{idVendor}=="050d", ATTR{idProduct}=="1100",
MODE="664", GROUP="nut"

Using udevadm monitor and plugging in the USB:
KERNEL[1308961682.706704] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1
(usb)
KERNEL[1308961682.709615] add
/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0 (usb)
KERNEL[1308961682.709674] add
/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/0003:050D:1100.0007 (hid)
KERNEL[1308961682.979776] add
/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/usb/hiddev0 (usb)
KERNEL[1308961682.979802] add
/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/0003:050D:1100.0007/hidraw/hidraw0
(hidraw)

However, the usb devices are created in root group and without read access
to nut group.
$ ls -l /dev/usb
crw------- 1 root root 180, 96 2011-06-24 20:43 hiddev0

Package information:
$ apt-cache showpkg nut
Package: nut
Versions:
2.6.0-1ubuntu3
(/var/lib/apt/lists/ubuntu.media.mit.edu_ubuntu_dists_natty_main_binary-amd64_Packages)
(/var/lib/dpkg/status)
 Description Language:
                 File:
/var/lib/apt/lists/ubuntu.media.mit.edu_ubuntu_dists_natty_main_binary-amd64_Packages
                  MD5: 1bb170829951b1b6cfee27c4bdc599b8


Reverse Depends:
  nut-xml,nut 2.2.2
  collectd-core,nut
  nut-snmp,nut 1.4.0
  nut-snmp,nut 1.4.1-pre1
  nut-cgi,nut 1.1.11
  nut-cgi,nut
Dependencies:
2.6.0-1ubuntu3 - libc6 (2 2.4) libupsclient1 (2 2.4.1) libusb-0.1-4 (2
2:0.1.12) libwrap0 (2 7.6-4~) adduser (0 (null)) lsb-base (2 3.0-6) udev (2
136-1) nut-cgi (0 (null)) nut-snmp (0 (null)) nut-dev (0 (null)) nut-xml (0
(null)) bash-completion (0 (null)) nut-dev (3 2.2.2) nut-doc (0 (null))
nut-hal-drivers (0 (null)) nut-usb (3 2.1.0-3) ups-monitor (0 (null))
nut-doc (0 (null))
Provides:
2.6.0-1ubuntu3 - ups-monitor nut-usb nut-doc
Reverse Provides:
----------------------

So, what to try next?  Do I have a udev problem?

Thanks for any pointers.

Martin

-- 
Martin Ewing
Branford, Connecticut
martin.s.ewing at gmail.com
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On Jun 24, 2011, at 8:50 PM, Martin Ewing wrote:
> I had been using NUT's Ubuntu package (64 bit) with no problems  
> until upgrading to Ubuntu 11.04.
What was the previous NUT package version?
> Now, I get the following message when I try usbhid-ups:
>
> $ sudo /lib/nut/usbhid-ups -a mybelkin
> Network UPS Tools - Generic HID driver 0.35 (2.6.0)
> USB communication driver 0.31
> Can't claim USB device [050d:1100]: could not detach kernel driver  
> from interface 0: Operation not permitted
Do you get the same error if you add "-u root" to the command line? If
so, there might be something other than filesystem permissions causing  
this error.
> ups.conf:
> [mybelkin]
>     driver = usbhid-ups
>     port = auto
>     desc = "Belkin 1200 VA UPS"
>
> The udev rule seems OK:
> #  F6C1100-UNV, F6C1200-UNV  - usbhid-ups
> ATTR{idVendor}=="050d", ATTR{idProduct}=="1100",
MODE="664",
> GROUP="nut"
>
> Using udevadm monitor and plugging in the USB:
> KERNEL[1308961682.706704] add      /devices/pci0000:00/0000:00:1d.0/ 
> usb6/6-1 (usb)
> KERNEL[1308961682.709615] add      /devices/pci0000:00/0000:00:1d.0/ 
> usb6/6-1/6-1:1.0 (usb)
> KERNEL[1308961682.709674] add      /devices/pci0000:00/0000:00:1d.0/ 
> usb6/6-1/6-1:1.0/0003:050D:1100.0007 (hid)
> KERNEL[1308961682.979776] add      /devices/pci0000:00/0000:00:1d.0/ 
> usb6/6-1/6-1:1.0/usb/hiddev0 (usb)
> KERNEL[1308961682.979802] add      /devices/pci0000:00/0000:00:1d.0/ 
> usb6/6-1/6-1:1.0/0003:050D:1100.0007/hidraw/hidraw0 (hidraw)
>
> However, the usb devices are created in root group and without read  
> access to nut group.
> $ ls -l /dev/usb
> crw------- 1 root root 180, 96 2011-06-24 20:43 hiddev0
This device would disappear if the detach error hadn't occurred.

Around the time of the first udev event listed above, udev should have  
created /dev/bus/usb/006/001, and that node should be owned by group  
nut.

I just upgraded to 11.04, and the tripplite_usb driver did not have a  
problem attaching to it. (This driver uses the same method of  
detaching the kernel HID driver as usbhid-ups.)

If I have time later this weekend, I'll swap out that UPS for one  
which uses the usbhid-ups driver and see if I can reproduce the problem.