W500 thermal sensors and fan speed control

[mako777]

Hello everyone
As i was repasting and upgrading ram in my W500 I thougt I will check where those temperature sensors really are and I'd like to share my findings.
My search was based on ThinkWiki T500 entry as it's almost the same laptop (http://www.thinkwiki.org/wiki/Thermal_S ... nkPad_T500).

I (User:jal2) had a look into the schematics of the T500/W500 mainboard. There are thermal sensors at the CPU (internal diode), GbE (Q21), under dem SO-DIMM slots (Q31), graphics chip (discrete only, internal diode), at the WLAN slot (Q104) and at the bottom side below the ICH (Q93). All Qxx are small, three pin transistors marked in the silk screen. These sensors are connected to a MAX6693 (U4), which also measures its own temperature.

I looked at the motherboard, found all of these sensors and marked them on this picture.
Also mappings of these sensors are as follows:

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Index in "thermal"	Part on MB	Location
01							CPU (internal diode)
02				Q104			WLAN (mini PCIe near GPU)
03				U4			Cardbus/ExpressCard Bay (in the center, about 10mm from board edge)
04							Radeon GPU (internal diode)
09				Q31			RAM (in the center, on board edge, under the black tape)
10				Q93			ICH9/Southbridge (on the bottom side of PCB, in top right corner, about 5mm from ICH9
11				Q21			WWAN/GbE (mini PCIe near CPU, about 10mm from CPU socket and 5mm from GbE corner

And complete snipplet for sensors.conf:

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chip "coretemp-isa-0000"
	label temp2 "Intel: Core 0"
	label temp3 "Intel: Core 1"
 
chip "thinkpad-isa-0000"
	label fan1   "00 Fan"
	label temp1  "01 CPU (ACPI)"
	label temp2  "02 WLAN (PCIe near GPU)"
	label temp3  "03 Cardbus/ExpressCard Bay"
	label temp4  "04 Radeon GPU"
	label temp5  "05 Main battery A"
	label temp6  "06 Ultrabay battery A"
	label temp7  "07 Main Battery B"
	label temp8  "08 Ultrabay battery B"
	label temp9  "09 RAM (slightly below)"
	label temp10 "10 ICH9 (on the other side of PCB)"
	label temp11 "11 WWAN, GbE (PCIe near CPU)"
	label temp12 "12 not used"
	label temp13 "13 not used"
	label temp14 "14 not used"
	label temp15 "15 not used"
	label temp16 "16 not used"

chip "acpitz-virtual-0"
	label temp1  "ACPI: CPU"
	label temp2  "ACPI: Intel Core 1"

And regarding fan speed, it's as follows:

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Level		RPM
0			stopped
1			~1700-1900
2			~2600-2800
3,4,5		~2900-3100
6,7			~3400-3700
			from 8 to 63 there is nothing (it sets itself back to 7)
64-127		~4200-4400 (full speed; disengaged)
128 and up	auto

I think this explains everything regarding those sensors in W500