[ltp] fan, old, Always-on problem. thinkwiki need some corrections.

[Alexey Fisher]

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If somebody steal care about this problem.
1.
this post
http://www.thinkwiki.org/wiki/Talk:Problem_with_fan_noise#Correct_BIOS_settings.3F

make the trick. Disabling speedstep in BIOS and using kernel
speedstep_module make a workaround for my thinkpad t43.

2.
On more issue may help to fix thinkpad_acpi for always_on ( I hope ):
switching AC to BAT and back to AC will reset fan ( or EC ) and disable
it if sensors are cold. IMHO some watchdog-reseting of EC can be good.

3.
for t43 only!
http://thinkwiki.org/wiki/Image:T43-thermal-sensors.jpg
The 0xC1 sensor is *not* southbridge. The sensor is max1989 located
under the southbridge. This is "Multichannel Remote/Local Temperature
Sensors" but used only local one.It show temperature of
southbridg+wlan+_clock_generator_ .
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2313


4.
most of heating in this area produce clock  generator (cy28441) located
left of  southbridge ( if 0xC1 show 43C i will say cy28441 is about 50C )



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