How to disable acpi thermal?

The man pages don't appear to be very helpful.  How do I
disable ACPI thermal from shutting down my machine when it
incorrectly is detecting false temperature readings?
Do I have to disable ACPI altogether?  Can I safely kill
the acpi_thermal thread?

Thermal zone 0 skyrockets past 110C in a couple of minutes
when trying to build a kernel.  All the other zones stay
relatively static.  I suspect something is wrong somewhere
because this machine is very lightly loaded and has never
had a problem until now.  I just upgraded it from 4.x to
7.0.

FreeBSD slrtr 7.0-PRERELEASE FreeBSD 7.0-PRERELEASE #0: Wed Jan  9 
14:01:39 EST 2008 
root_at_ninja1:/opt/FreeBSD/obj/opt/FreeBSD/src/src/sys/ninja  i386

$ sysctl -a | grep acpi
debug.acpi.suspend_bounce: 0
debug.acpi.do_powerstate: 1
debug.acpi.acpi_ca_version: 20070320
debug.acpi.ec.timeout: 750
debug.acpi.ec.polled: 0
debug.acpi.ec.burst: 0
debug.acpi.semaphore_debug: 0
debug.acpi.resume_beep: 0
hw.acpi.supported_sleep_state: S1 S4 S5
hw.acpi.power_button_state: S5
hw.acpi.sleep_button_state: S1
hw.acpi.lid_switch_state: NONE
hw.acpi.standby_state: S1
hw.acpi.suspend_state: S3
hw.acpi.sleep_delay: 1
hw.acpi.s4bios: 0
hw.acpi.verbose: 0
hw.acpi.disable_on_reboot: 0
hw.acpi.handle_reboot: 0
hw.acpi.reset_video: 0
hw.acpi.cpu.cx_lowest: C1
hw.acpi.thermal.min_runtime: 0
hw.acpi.thermal.polling_rate: 10
hw.acpi.thermal.user_override: 0
hw.acpi.thermal.tz0.temperature: 45.0C
hw.acpi.thermal.tz0.active: -1
hw.acpi.thermal.tz0.passive_cooling: 0
hw.acpi.thermal.tz0.thermal_flags: 0
hw.acpi.thermal.tz0._PSV: -1
hw.acpi.thermal.tz0._HOT: -1
hw.acpi.thermal.tz0._CRT: 110.0C
hw.acpi.thermal.tz0._ACx: 77.0C -1 -1 -1 -1 -1 -1 -1 -1 -1
hw.acpi.thermal.tz1.temperature: 5.0C
hw.acpi.thermal.tz1.active: -1
hw.acpi.thermal.tz1.passive_cooling: 0
hw.acpi.thermal.tz1.thermal_flags: 0
hw.acpi.thermal.tz1._PSV: -1
hw.acpi.thermal.tz1._HOT: -1
hw.acpi.thermal.tz1._CRT: 110.0C
hw.acpi.thermal.tz1._ACx: 77.0C -1 -1 -1 -1 -1 -1 -1 -1 -1
hw.acpi.thermal.tz2.temperature: 36.0C
hw.acpi.thermal.tz2.active: -1
hw.acpi.thermal.tz2.passive_cooling: 0
hw.acpi.thermal.tz2.thermal_flags: 0
hw.acpi.thermal.tz2._PSV: -1
hw.acpi.thermal.tz2._HOT: -1
hw.acpi.thermal.tz2._CRT: 80.0C
hw.acpi.thermal.tz2._ACx: 47.0C -1 -1 -1 -1 -1 -1 -1 -1 -1
machdep.acpi_timer_freq: 3579545
machdep.acpi_root: 1009936
dev.acpi.0.%desc: INTEL 024B
dev.acpi.0.%driver: acpi
dev.acpi.0.%parent: nexus0
dev.acpi_sysresource.0.%desc: System Resource
dev.acpi_sysresource.0.%driver: acpi_sysresource
dev.acpi_sysresource.0.%location: handle=\_SB_.PCI0.ISA0.SBSI
dev.acpi_sysresource.0.%pnpinfo: _HID=PNP0C02 _UID=1
dev.acpi_sysresource.0.%parent: acpi0
dev.acpi_sysresource.1.%desc: System Resource
dev.acpi_sysresource.1.%driver: acpi_sysresource
dev.acpi_sysresource.1.%location: handle=\_SB_.PCI0.ISA0.SBRD
dev.acpi_sysresource.1.%pnpinfo: _HID=PNP0C02 _UID=2
dev.acpi_sysresource.1.%parent: acpi0
dev.acpi_sysresource.2.%desc: System Resource
dev.acpi_sysresource.2.%driver: acpi_sysresource
dev.acpi_sysresource.2.%location: handle=\_SB_.PCI0.ISA0.SBDM
dev.acpi_sysresource.2.%pnpinfo: _HID=PNP0C02 _UID=3
dev.acpi_sysresource.2.%parent: acpi0
dev.acpi_timer.0.%desc: 24-bit timer at 3.579545MHz
dev.acpi_timer.0.%driver: acpi_timer
dev.acpi_timer.0.%location: unknown
dev.acpi_timer.0.%pnpinfo: unknown
dev.acpi_timer.0.%parent: acpi0
dev.acpi_ec.0.%desc: Embedded Controller: GPE 0x4
dev.acpi_ec.0.%driver: acpi_ec
dev.acpi_ec.0.%location: handle=\_SB_.PCI0.ISA0.EC0_
dev.acpi_ec.0.%pnpinfo: _HID=PNP0C09 _UID=0
dev.acpi_ec.0.%parent: acpi0
dev.pci_link.0.%parent: acpi0
dev.pci_link.1.%parent: acpi0
dev.pci_link.2.%parent: acpi0
dev.pci_link.3.%parent: acpi0
dev.pci_link.4.%parent: acpi0
dev.pci_link.5.%parent: acpi0
dev.pci_link.6.%parent: acpi0
dev.pci_link.7.%parent: acpi0
dev.pci_link.8.%parent: acpi0
dev.pci_link.9.%parent: acpi0
dev.pci_link.10.%parent: acpi0
dev.pci_link.11.%parent: acpi0
dev.pci_link.12.%parent: acpi0
dev.pci_link.13.%parent: acpi0
dev.pci_link.14.%parent: acpi0
dev.pci_link.15.%parent: acpi0
dev.cpu.0.%parent: acpi0
dev.acpi_button.0.%desc: Sleep Button
dev.acpi_button.0.%driver: acpi_button
dev.acpi_button.0.%location: handle=\_SB_.SLPB
dev.acpi_button.0.%pnpinfo: _HID=PNP0C0E _UID=0
dev.acpi_button.0.%parent: acpi0
dev.pcib.0.%parent: acpi0
dev.pcib.2.%parent: acpi0
dev.acpi_tz.0.%desc: Thermal Zone
dev.acpi_tz.0.%driver: acpi_tz
dev.acpi_tz.0.%location: handle=\_TZ_.TZC0
dev.acpi_tz.0.%pnpinfo: _HID=none _UID=0
dev.acpi_tz.0.%parent: acpi0
dev.acpi_tz.1.%desc: Thermal Zone
dev.acpi_tz.1.%driver: acpi_tz
dev.acpi_tz.1.%location: handle=\_TZ_.TZC1
dev.acpi_tz.1.%pnpinfo: _HID=none _UID=0
dev.acpi_tz.1.%parent: acpi0
dev.acpi_tz.2.%desc: Thermal Zone
dev.acpi_tz.2.%driver: acpi_tz
dev.acpi_tz.2.%location: handle=\_TZ_.TZE0
dev.acpi_tz.2.%pnpinfo: _HID=none _UID=0
dev.acpi_tz.2.%parent: acpi0
dev.attimer.0.%parent: acpi0
dev.attimer.1.%parent: acpi0
dev.sio.0.%parent: acpi0
dev.sio.1.%parent: acpi0
dev.fdc.0.%parent: acpi0
dev.atkbdc.0.%parent: acpi0
dev.psmcpnp.0.%parent: acpi0
dev.atdma.0.%parent: acpi0
dev.atpic.0.%parent: acpi0
dev.npxisa.0.%parent: acpi0

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