[ltp] possible fan firmware bug after WLAN was active on X61s

[Thomas Kahle]

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Hi Tino,

I experienced the same problem, it is described a bit at
http://pi-ist-genau-3.de/?page_id=344.
My conclusion was, that the sensor which measures the temperature at the
wlan-card is used to compute the fan speed, while the fan, located in
the top left of the mainboard, does not cool the wlan at all, so this is
just of stupid.
Using the fan control scripts from thinkpad wiki you can switch of the
fan and see that there is no change in temperature at the wlan-card.

So two things you should consider :

- -) Enable Power-Saving for the wlan card, this significantly reduces the
temperature.
Basicly do a
for i in `echo /sys/bus/pci/drivers/iwl4965/*/power_level`; do
echo 5 > $i
done
after every boot, resume, iwl4965 module reload, etc.

- -) Use fan control scripts to change the threshshold of the temperature
at the wlan-card. You find them on the thinkwiki.

hope this helps
Thomas



Tino Keitel wrote:
| Hi folks,
|
| I get the following strange behaviour of the fan in my X61s:
|
| - the computer is idle, the fan sometimes runs but goes of after a
|   while
|
| - I enable the WLAN (load the driver, assosicate to an AP), use the
|   connection a bit
|
| - the fan now always runs and doesn't go off anymore
|
| - I disable WLAN and unload all related modules
|
| - the fan still runs forever, even after 10 minutes after I disabled
|   the WLAN
|
| - sensors shows low values for all temperature sensors (below 37°C,
|   temp1 shows 42°C)
|
| - suspend to RAM, followed by an immediate resume
|
| - the fan goes off immediately after resume, and stays off for a while
|
| - after some minutes, the behaviour before the WLAN was active is
|   restored (fan runs sometimes, but goes off after a while)
|
| To me, this looks like a firmware bug. Were there any fan bugs fixed in
| recent firmwares?
|
| I have not updated mine, as I don't know how to do that without windows
| and without a docking station. I tried a USB CD drive and the .ISO
| image supplied by Lenovo, without success (the drive wasn't found by
| the boot floppy part). Any hints are welcome.
|
| Regards,
| Tino

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