acpid oddity

[Sandy Harris]

9.04 on an Intel Atom board. Single core hyperthreaded,
so Linux thinks there are two CPUs.

System monitor shows one CPU always pegged at 100%.
Top shows kacpid using much resource.

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
     18 root       15  -5       0    0    0 R  100  0.0  37:12.00
kacpid
  2415 root      20   0  341m  58m 8596 R   25  2.9   6:49.94 Xorg
 3010 sandy     20   0 32352  18m  13m S   22  0.9   6:58.20 gnome-system-mo
 3111 sandy     20   0  256m 127m  26m S    4  6.4   4:40.32 firefox
 3008 sandy     20   0 24972  12m 8300 S    2  0.6   0:00.99 xfce4-terminal
 2974 sandy     20   0 19888  10m 7392 S    0  0.5   0:18.23 xfwm4

sudo kill -9 18 has no effect. Nor does enabling or disabling
ACPI in the System-> Services menu.

-- 
Sandy Harris,
Quanzhou, Fujian, China