Comment 4 for bug 134311

I also have this problem, it started after I finally found out my APC UPS (350 as well) wasn't configured in my system. At some point it also gets CPU hoggy...

top - 22:24:38 up 15 days, 23:39, 2 users, load average: 1.12, 1.19, 0.86
Tasks: 207 total, 5 running, 202 sleeping, 0 stopped, 0 zombie
Cpu(s): 57.8%us, 41.2%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 1.0%si, 0.0%st
Mem: 1035688k total, 971556k used, 64132k free, 9128k buffers
Swap: 3906464k total, 2715132k used, 1191332k free, 333604k cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 4850 root 25 0 2528m 169m 492 R 97.7 16.8 20:09.52 hald-addon-hid-

workaround: kill the process hald-addon-hid-ups and kill apcupsd and restart /etc/init.d/apcupsd