Hi Charles,

I can see your thinking, but no, this isn't a VM, nor is the kernel I'm
using a Hypervisor - it's a plain old machine:

root@barnbox:~# grep -i hyper /proc/cpuinfo
root@barnbox:~# 


I updated the machine with apt-get (again) and I also updated the machine's 
BIOS. Prior to doing the updates I tried the lsusb command and it worked:

root@barnbox:~# lsusb -vvv -d051d:

Bus 001 Device 003: ID 051d:0002 American Power Conversion Uninterruptible 
Power Supply
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x051d American Power Conversion
  idProduct          0x0002 Uninterruptible Power Supply
  bcdDevice            0.06
  iManufacturer           3 American Power Conversion
  iProduct                1 Back-UPS CS 350 FW:807.q10 .I USB FW:q10 
  iSerial                 2 4B1419P32390  
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                2mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength    1217
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0006  1x 6 bytes
        bInterval             100
Device Status:     0x0000
  (Bus Powered)
root@barnbox:~# 



However, weirdly, since doing the update, usbhid-ups no longer segfaults - it 
still doesn't work, but it's interesting

Annoyingly, I never ran the intermediate stages, so I don't know which
change made the difference (I suppose it could be HP's firmware doing
something funky, but I doubt it...):

I believe this usbhid-ups command should match the UPS, but it appears
to skip it:

root@barnbox:~# /lib/nut/usbhid-ups -u nut -a apc -x bus=001 -x vendorid=051D 
-x productid=0002 -DDDD
Network UPS Tools - Generic HID driver 0.38 (2.7.1)
USB communication driver 0.32
   0.000000     debug level is '4'
   0.000409     upsdrv_initups...
   0.022724     Checking device (1D6B/0003) (005/001)
   0.023048     - VendorID: 1d6b
   0.023060     - ProductID: 0003
   0.023064     - Manufacturer: unknown
   0.023067     - Product: unknown
   0.023069     - Serial Number: unknown
   0.023072     - Bus: 005
   0.023075     Trying to match device
   0.023087     Device does not match - skipping
   0.023225     Checking device (1D6B/0002) (004/001)
   0.023392     - VendorID: 1d6b
   0.023405     - ProductID: 0002
   0.023409     - Manufacturer: unknown
   0.023412     - Product: unknown
   0.023414     - Serial Number: unknown
   0.023417     - Bus: 004
   0.023420     Trying to match device
   0.023424     Device does not match - skipping
   0.023492     Checking device (1D6B/0001) (003/001)
   0.054600     - VendorID: 1d6b
   0.054612     - ProductID: 0001
   0.054616     - Manufacturer: unknown
   0.054619     - Product: unknown
   0.054622     - Serial Number: unknown
   0.054624     - Bus: 003
   0.054627     Trying to match device
   0.054632     Device does not match - skipping
   0.062511     Checking device (0424/4030) (002/004)
   0.062541     - VendorID: 0424
   0.062546     - ProductID: 4030
   0.062549     - Manufacturer: unknown
   0.062552     - Product: unknown
   0.062555     - Serial Number: unknown
   0.062557     - Bus: 002
   0.062560     Trying to match device
   0.062564     Device does not match - skipping
   0.062570     Checking device (0424/2660) (002/003)
   0.062580     - VendorID: 0424
   0.062583     - ProductID: 2660
   0.062586     - Manufacturer: unknown
   0.062588     - Product: unknown
   0.062591     - Serial Number: unknown
   0.062593     - Bus: 002
   0.062596     Trying to match device
   0.062599     Device does not match - skipping
   0.062603     Checking device (8087/0024) (002/002)
   0.062611     - VendorID: 8087
   0.062614     - ProductID: 0024
   0.062617     - Manufacturer: unknown
   0.062619     - Product: unknown
   0.062622     - Serial Number: unknown
   0.062624     - Bus: 002
   0.062627     Trying to match device
   0.062630     Device does not match - skipping
   0.062634     Checking device (1D6B/0002) (002/001)
   0.062644     - VendorID: 1d6b
   0.062647     - ProductID: 0002
   0.062649     - Manufacturer: unknown
   0.062652     - Product: unknown
   0.062655     - Serial Number: unknown
   0.062657     - Bus: 002
   0.062659     Trying to match device
   0.062662     Device does not match - skipping
   0.062667     Checking device (051D/0002) (001/003)
   0.100598     - VendorID: 051d
   0.100611     - ProductID: 0002
   0.100615     - Manufacturer: American Power Conversion
   0.100618     - Product: Back-UPS CS 350 FW:807.q10 .I USB FW:q10 
   0.100621     - Serial Number: 4B1419P32390  
   0.100624     - Bus: 001
   0.100626     Trying to match device
   0.100668     Device does not match - skipping
   0.100679     Checking device (8087/0024) (001/002)
   0.100694     - VendorID: 8087
   0.100697     - ProductID: 0024
   0.100700     - Manufacturer: unknown
   0.100703     - Product: unknown
   0.100705     - Serial Number: unknown
   0.100708     - Bus: 001
   0.100710     Trying to match device
   0.100714     Device does not match - skipping
   0.100719     Checking device (1D6B/0002) (001/001)
   0.100731     - VendorID: 1d6b
   0.100734     - ProductID: 0002
   0.100737     - Manufacturer: unknown
   0.100739     - Product: unknown
   0.100742     - Serial Number: unknown
   0.100744     - Bus: 001
   0.100747     Trying to match device
   0.100749     Device does not match - skipping
   0.100754     No appropriate HID device found
   0.100758     No matching HID UPS found


Still, at least it doesn't segfault!

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https://bugs.launchpad.net/bugs/1483615

Title:
  usbhid-ups driver segfaults on discovery of UPS

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