[ltp] T43, cpu temperature and control of fan speed

[Ben Jencks]

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Marcel Selhorst <thinkpad@selhorst.net> writes:

> Hi,
>
> I recently bought a T43 Thinkpad 2668-74G, which comes with a
> 2GHz cpu. My CPU-temperature lies within 50-60 degree Celsius,
> depending on the CPU state (running cpufreqd and the
> conservative governor). But when the CPU is really powering
> during encoding or compiling, the CPU temperature goes up between
> 80 and 90 degree. What's really disturbing me is the fact, that the
> fan is always running at around 4000 RPM, I am already running a
> script which turns it off and on depending on the CPU-temp
> (measuring fan and CPU-temp with the IBM-ACPI kernel module), but
> I'd like to "boost" the fan to maximum RPMs, when the CPU temp goes
> up over a certain value. (I already updated BIOS and EC-Firmware).
>
> I saw in the ibm-acpi sourcecode that setting speed / level is only
> possible on certain thinkpads. Has anyone found a way to manually
> increase / decrease the fan speed on a T43-model?
> Did anyone observe similar CPU-temperature values as I do?

On my T43p 2668-H8U (2.13GHz) I see similar temperatures. This is under both linux
and freebsd, with no automatic scaling. At 800 MHz, the lowest speedstep
value, the temperature is between 50-60 depending on load. When I crank
it up to 2133 MHz and compile something big, the temperature gets close
to 90. The fan is usually running at ~4000 RPM, but when it gets really
hot, I think I remember it going to a higher speed (didn't notice the
number). I've just assumed this is normal.
- -- 
Ben
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