thermal trip on hp nx6125

[Sam Leffler]

I've got an nx6125 running amd64 current.  When I take the laptop off ac 
I get an immediate thermal shutdown from zone 2 going critical.  I 
traced temp readings and see the following:

acpi_tz0: newflags 0, temp 56.0 @ ticks 10080
acpi_tz1: newflags 0, temp 49.0 @ ticks 10081
acpi_tz2: newflags 0, temp 26.6 @ ticks 10088
acpi_tz0: newflags 0, temp 53.0 @ ticks 20096
acpi_tz1: newflags 0, temp 49.0 @ ticks 20105
acpi_tz2: newflags 0, temp 26.6 @ ticks 20114
acpi_tz0: newflags 0, temp 52.0 @ ticks 30123
acpi_tz1: newflags 0, temp 49.0 @ ticks 30132
acpi_tz2: newflags 0, temp 26.6 @ ticks 30141
acpi_tz0: newflags 0, temp 51.0 @ ticks 35148
acpi_tz0: newflags 0, temp 51.0 @ ticks 35185
acpi_tz1: newflags 0, temp 49.0 @ ticks 35194
acpi_tz1: newflags 0, temp 49.0 @ ticks 35209
acpi_tz2: newflags 0, temp 26.6 @ ticks 35219
acpi_tz0: newflags 0, temp 51.0 @ ticks 45229
acpi_tz1: newflags 0, temp 48.0 @ ticks 45238
acpi_tz2: newflags 9, temp 152.1 @ ticks 45247
acpi_tz0: newflags 0, temp 50.0 @ ticks 55256
acpi_tz1: newflags 0, temp 48.0 @ ticks 55265
acpi_tz2: newflags 9, temp 152.1 @ ticks 55273
acpi_tz0: newflags 0, temp 50.0 @ ticks 65283
acpi_tz1: newflags 0, temp 48.0 @ ticks 65293
acpi_tz2: newflags 9, temp 152.1 @ ticks 65301
acpi_tz2: WARNING - current temperature (152.1C) exceeds safe limits

This condition persists if I disable the shutdown call in 
acpi_thermal.c.  Once returned to ac the zone immediately returns to 
<30C.  I felt around for a hotspot but cannot find one so figure this 
may be an acpi issue?

I checked the mailing list archives and found almost an identical 
complaint for an nc6230:

http://monkey.org/freebsd/archive/freebsd-acpi/200509/msg00071.html

I've stuck dmesg (w/ debug printfs) and output from acpidump -t -d on 
the web:

http://people.freebsd.org/~sam/nx6125.dmesg
http://people.freebsd.org/~sam/nx6125.acpidump

Any suggestions on what to look for?  FWIW the fan in zone 0 does seem 
to kick in a fair amount even when the system is idle.

	Sam