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I have an apc smart-ups 750 connected via usb to an old rev. a bondi blue imac running Debian Sarge. When I try to start apcupsd I get the following message:
Tue Aug 09 11:54:53 EDT 2005 apcupsd FATAL ERROR in linux-usb.c at line 575
Cannot find UPS device --
For a link to detailed USB trouble shooting information,
please see (URL redacted so that I can post this message).
Tue Aug 09 11:54:53 EDT 2005 apcupsd error shutdown completed
I've made the necessary /dev files using the examples/make-hiddev script. I've gone through the USB troubleshooting page at Checking-Out-Your-USB-Subsystem.html (sorry, haven't posted enough to include the full url) with the following results.
The problem was that I do not have a USB mouse or keyboard. So I excluded USB HID (Human Interface Device) from my kernel. The UPS daemon uses the HID drivers to control the UPS. I recompiled the kernel with the USB HID options built in (one option's help notes even mentioned the UPS!). The system then worked perfectly. I even leave the DEVICE setting blank.