[Nut-upsuser] APC SmartUPS 2200XL + UDEV + USB = tcgetattr : Invalid argument

Richard richard-nut at rain4us.net
Wed Jul 28 22:28:39 UTC 2010

I need direction.  I don't know what to google for anymore.  I am unable 
to get my SmartUPS 2200XL to be recognized.  My suspicions are that it's 
UDEV or Kernel related.  I've updated the kernel to the highest version 
I feel comfortable with due to other things that run on the server, and 
I've updated UDEV a bit too.

When I plug in the USB cable from the UPS into the server, I see the usb 
driver recognizing the UPS, but I don't see it assigning a device name.  
I added in a manually created udev rule and now the device appears, but 
it seems like the wrong driver is attached to the device.  As this is my 
first time setting up NUT, I'm unsure if I'm configuring NUT incorrectly 
or if I have a USB/UDEV/Kernel  issue.

Does anyone have any suggestions or hints as to what I can search for 
next to solve this issue?  I'm going to try the latest build from svn. 

Here is what I have and what I've seen so far.  I thought about 
pastebin'ing this but figured it might help the next person who is 

Server OS: Slackware 12.0
Kernel Version:
UDEV version: 135
NUT version: 2.4.3

The following output is from

===== Log file output =====

==> /var/log/messages <==
Jul 28 12:26:09 swmweb kernel: usb 4-2: configuration #1 chosen from 1 

==> /var/log/syslog <==
Jul 28 12:26:09 swmweb kernel: hub 1-0:1.0: unable to enumerate USB 
device on port 6

==> /var/log/messages <==
Jul 28 12:26:11 swmweb kernel: hiddev96: USB HID v1.10 Device [American 
Power Conversion Smart-UPS 2200 XL FW:690.19.D USB FW:7.4] on 

===== What I see in /proc ======

/proc/bus/usb/devices {lines 43-51}

T:  Bus=04 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=1.5 MxCh= 0
D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=051d ProdID=0002 Rev= 0.06
S:  Manufacturer=American Power Conversion
S:  Product=Smart-UPS 2200 XL FW:690.19.D USB FW:7.4
S:  SerialNumber=JS1005032730
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 30mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=00 Driver=usbhid
E:  Ad=81(I) Atr=03(Int.) MxPS=   6 Ivl=100ms

===== what I see in /sys/block ======

# ls /sys/block
hda/    loop2/  loop6/  ram1/   ram13/  ram3/  ram7/  sdb/  sdf/
hdb/    loop3/  loop7/  ram10/  ram14/  ram4/  ram8/  sdc/
loop0/  loop4/  md0/    ram11/  ram15/  ram5/  ram9/  sdd/
loop1/  loop5/  ram0/   ram12/  ram2/   ram6/  sda/   sde/

===== What udevadm (udevinfo) sees =====

#  udevadm info -a -p /sys/devices/pci0000:00/0000:00:1d.2 /usb4/4-2

Udevinfo starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:1d.2/usb4/4-2':
    ATTR{bNumInterfaces}==" 1"
    ATTR{bMaxPower}==" 30mA"
    ATTR{version}==" 1.10"
    ATTR{manufacturer}=="American Power Conversion"
    ATTR{product}=="Smart-UPS 2200 XL FW:690.19.D USB FW:7.4"

    <snip the rest of the udevinfo tree walk>

===== The rule I made since no /dev/device was being created =====

# cat /etc/udev/rules.d/90-local-udev.rules

#/dev/smartups UPS
SUBSYSTEMS=="usb", ATTRS{manufacturer}=="American Power Conversion", 
ATTRS{product}=="Smart-UPS 2200 XL FW:690.19.D USB FW:7.4", 
ATTRS{serial}=="JS1005032730", NAME="apcusb", SYMLINK+="smartups", 
MODE="0660", GROUP="nut"

===== ups.conf =====
# cat /etc/nut/ups.conf

        driver = apcsmart
        port = /dev/apcusb
        desc = "Main 2200 XP with battery pack"

===== This is what happens when apcsmart is executed =====
# cd /usr/libexec/nut/
# ./apcsmart  -a 2200XL

Network UPS Tools - APC Smart protocol driver 2.03 (2.4.3)
APC command table version 2.1
tcgetattr(/dev/apcusb): Invalid argument

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