APC UPS control system

If all there things check out and you still can’t see the UPS, something is

more seriously wrong than this manual can cover – ﬁnd expert help. If you

are unable to list USB devices or drivers,you kernel may not be USB-capable

and that needs to be ﬁxed. Please check if your kernel has the three patches

listed in the <apcupsd-source>/examples directory. Each of the ﬁles ends

with the name .patch, and at the current writingthey are:

linux-2.4.20-killpower.patch

linux-2.4.20-USB-reject.patch

linux-2.6.0-USB-queue-overflow.patch

For example, RedHat 9 and/or pre-2.4.22 kernels are known to need the

linux-2.4.20-USB-reject.patch for APC SmartUPS XL series devices.

Thereare alsoa few email ﬁles that you can consult in the examples directory

for additional information and details.

Finally, check yourKernel Conﬁg. You will ﬁnd more information about it

at:

Kernel Conﬁg.

KNOWN ISSUES WITH BSD USB

The BSD USB driver for apcupsd is BETA software and has some known

issues.

- FreeBSD lockups: Some users have experienced lockups (ap cupsd stops

responding) on FreeBSD systems. In at least one case this problem was

worked around by disabling pthreads (—disable-pthreads ﬂag to conﬁgure).

The problem seems to be caused by a FreeBSD kernel bug.

- FreeBSDkernel panics if USBcable is unplugged while apcupsd is running.

This is another kernel bug and is most easily worked around by not hot-

unplugging the UPS while apcupsd is running.

PLATFORMS& VERSIONS

The new (beta) FreeBSD USB driver supports FreeBSD, OpenBSD and

NetBSD. (Thanks go to the *BSD developers who kept a nearly identical

interface across all three platforms.)

The driver has been tested with the following platform versions:

FreeBSD-5.3 (Primary development platform)