[ltp] Noisy fan on T42

[Alexandru D. Salcianu]

Hello Alejandro,

Could you please tell us what is your exact configuration (hw, sw,
bios version, embedded controller)?  There are many kinds of T42's,
and I've encountered both people who are happy with their fan noise
and people who have big problems.  E.g., some people complain that
after they upgraded to the latest BIOS, the fan became noisier.
Knowing the exact configuration will help us isolate the problem.

Also, regarding the [lack of] fan control in Linux, can anyone send a
pointer to a document that describes how this is done?  Is there a
standard anywhere?  By reading the doc for ibm-acpi, I know that it is
possible to control the fan speed on some models from the X series.
So, it should be possible to do some (limited) fan control from
software.

Thanks,

Alex

> >Linux doesn't control the fan, it's the ibm bios, which control the fan.
> >We try only to reduce the temperature through bios, so the bios stops
> >the fan, thats the problem. Controlling the fan is still not possible
> >for T40 and later as far as I know.
> >  
> >
> I can only say this is the same case for me. I have a T42 with the stock 
> IBM bios and works perfectly. The only time I can hear the Fan is when 
> the CPU THM is pretty hot. The BIOS notices it's so hot that it makes 
> the Fan hit the CPU with all it has. (This happends when I use the PC 
> plugged and in the bed, which used to put my CPU at 1800mhz and with few 
> space for the air to leave the laptop casing) anyway. It works for me 
> here. You should test it this way.