[ltp] Noisy fan on T42

[Alexandru D. Salcianu]

Hello!

As explained on its webpage http://www.xs4all.nl/~bsamwel/laptop_mode/
laptop mode affects the HDD:

  Laptop mode [...] is a kernel "mode" that allows you to extend the
  battery life of your laptop.  It does this by intelligently grouping
  write activity on your disks, so that only reads of uncached data
  result in a disk spinup.  It causes a significant improvement in
  battery life (for usage patterns that allow it).

So, nothing about CPU, GPU, frequency scaling, etc.  I don't think
it's relevant for the fan noise problem, but I'll give it a try this
evening.

Thanks,

Alex

> From: Michele Lamarca <lammic@gmail.com>
> To: linux-thinkpad@linux-thinkpad.org
> Subject: Re: [ltp] Noisy fan on T42
> 
> On Wed, 09 Mar 2005 10:11:39 -0500, Alexandru D. Salcianu
> <salcianu@mit.edu> wrote:
> > I have no idea what the other temperatures indicated by the ibm-acpi
> > mean, but here they are:
> > 
> > [ibm]# cat thermal
> > temperatures:   43 47 34 49 33 -128 28 -128
> 
> Hello, I've got a T40 with radeon 7500 (dynamic clock scaling).
> It is my understanding that fan activation is function of some (maybe
> all?) of these temperatures, not just the first one.
> 
> This understanding is supported by the fact that my fan *usually*
> stops when the CPU is at 43 degrees, but sometimes it stops only when
> CPU temp reaches 30 degrees.
> However, fan speed does not vary significantly with temperatures.
> 
> Have you tried laptop mode?
> 
> Michele
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