Arduino Yun_USB-Host

Hello,

I bought an Arduino Yun.
Now, I would like to get the UPS status over the USB host.

Unfortunately "apcupsd" do not detect the UPS.

Console output "apctest":

2013-10-03 11:11:38 apctest 3.14.7 (1 August 2009) unknown
Checking configuration ...
Attached to driver: usb
sharenet.type = DISABLE
cable.type = CUSTOM_SMART

You are using a SMART cable type, so I'm entering SMART test mode
mode.type = USB_UPS
Setting up the port ...
apctest FATAL ERROR in linux-usb.c at line 609
Cannot find UPS device --
For a link to detailed USB trouble shooting information,
please see http://www.apcupsd.com/support.html.
apctest error termination completed

Console output "dmesg":

...
[ 44.360000] usb 1-1.1.2: New USB device found, idVendor=051d, idProduct=0002
[ 44.370000] usb 1-1.1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 44.370000] usb 1-1.1.2: Product: Back-UPS RS 1500G FW:878.L4 .I USB FW:L4
[ 44.370000] usb 1-1.1.2: Manufacturer: American Power Conversion
[ 44.380000] usb 1-1.1.2: SerialNumber: XXXXXXXXXXXX
...

My guess is that a driver is missing...
(APCUPSD User Manual)

Content of "/sys/bus/usb/drivers/":

hub
usb
usb-storage
usbfs
ushc

Thanks a lot