Re: FreeBSD 5.2-CURRENT on HP Omnibook 6000 - ACPI problem

Kevin Oberman wrote:
> This is not even ACPI. Many motherboards for modern P4 and K7 chips do a
> very low-level BIOS shutdown on over-temp. See ASUS, ABIT, or most any
> other mobo for a fairly useless blurb on this.
>
> From ABIT:
> "ABIT ThermalGuard Technology is a special designed for ABIT MB prevents
> CPU burning down by hardware cooling malfunction. With unique ABIT
> Hardware Monitoring chip and CPU thermal detector, ThermalGuard
> Technology can protect the better safety of all CPUs and customers' ABIT
> motherboards. When the temperature of CPU is over the default threshold
> degree, system immediately shut down by ABIT ThermalGuard It's
> great for preventing the lost of customers' investment. Unlike
> other manufactories, which use BIOS or software to delivery same
> feature. ABIT ThermalGuard Technology is much more reliable because it
> is hardware-controlled and uninterruptible."
>
> So, if the fan fails to turn on, it is perfectly possible that the
> system will power off regardless of ACPI. While ABIT makes it sound
> exclusive, it looks pretty much the same as ASUS "CPU Overtemp Protection
> System (COPS)" and Gigabyte calls it "Anti-Burn"

IMHO, this all stems from a Tom's Hardware article:
http://www20.tomshardware.com/cpu/20010917/index.html
Further coverage:
http://www20.tomshardware.com/column/20011029/index.html

A respected hardware review site publishes a spectacular video of an
Athlon literally vaporizing itself (when the heatsink/fan is taken off
during a Quake III timedemo) and suddenly everyone gets all worked up
about it (while the P4 throttles itself back and just strolls along at ~12
fps).  In any case, it was extraordinarily public coverage, and
manufacturers (especially their marketing people) have been in overdrive
on it ever since.

Jon Noack