APC UPS control system Monitoring and Tuning your UPS, Power Off killpower of UPS Does Not Work

Power Off (killpower) of UPS Does Not Work:

Currently (as of 3.10.6) the code to power off the UPS works only if you have a Linux kernel version 2.4.22 or greater, or you have applied the patches in the examples directory to your kernel.

apcupsd Cannot Reconnect After a Reboot:

If apcupsd does not connect to the USB port when you reboot, it is probably the appropriate kernel modules are not getting loaded correctly.

You can check this by bringing up your system, fiddling around until you get apcupsd to work with the UPS, then doing cat /proc/modules andnd save the output some place. Then reboot your computer and before you do anything else, do the cat /proc/modules again. Most likely you will find some of the usb modules are missing in the second listing.

There are two solutions:

•Ensure that you have the hotplug program loaded. It should fix the problem. This is a bit of magic, so we are not exactly sure how it works. The rpm I (Kern) have loaded is: hotplug-2001 02 14-15

You might want to read the man page on hotplug, and it might be necessary to cp /etc/hotplug/usb.rc /etc/init.d/hotplug to get it fully working.

•You can explicitly force the appropriate usb modules to be loaded by adding:

/sbin/modprobe <missing-module-name>

in the /etc/rc.d/init.d/apcupsd script just after the start) case (at about line 17). This will force the modules to be loaded before apcupsd is invoked.

Monitoring and Tuning your UPS

After you have verified that your UPS is working correctly, you will probably want to query the state of its health occasionally. The tools apcupsd gives

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