After the system starts up, and before you unplug/replug the UPS, can you see the UPS with lsusb?
What are the permissions on the corresponding /proc/bus/usb/*/* and/or /dev/bus/usb/*/* nodes for the UPS?
After the system starts up, and before you unplug/replug the UPS, can you see the UPS with lsusb?
What are the permissions on the corresponding /proc/bus/usb/*/* and/or /dev/bus/usb/*/* nodes for the UPS?