ACPI on hp nx6125 doesn't update battery state

Hi,
I bought a HP Compaq nx6125 2 days ago...
After booting the information in /proc/acpi/battery/C175/state update regulary, but after a while they don't. I don't see any errors in dmesg, /var/log/messages or /var/log/acpid.
Well, now the strange solution:
cat /proc/acpi/thermal_zone/TZ1/temperature
That's the thermal zone of the cpu. After doing this, the fan starts blowing for a while, the cpu usage increases to 100% for about 2 seconds (may vary), the systems repeats very slow.
Now the battery state updates, the system runs as normal. If you do a cat /proc/acpi/thermal_zone/TZ1/temperature now, nothing happens, after circa 5 minutes the same happens again.
The temperature looks correct all the time. viewing the temperature of another thermal zone doesn't help...

That's a bit strange, isn't it? ;)
I hope you can help me... :) should I provide some debugging information?

I'm running a 2.6.14 with gentoos patchset r2.

Bye,
Carsten

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