T43/T43p Fan Control

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vpn-user · #31 Post by **vpn-user** » Sat Nov 12, 2005 6:04 am

@christopher_wolf: Yes I tried it. No solution for me.

Eugene · #32 Post by **Eugene** » Sun Nov 13, 2005 10:36 pm

hello everyone
I found out :When cpu temp at around 43 C,the fan will start working at level 1.And fan will stop when cpu temp at 38 C
When cpu temp at around 46 C, fan Working at level 2,is a noisy level.
When cpu temp down to 40 ,fan will working at first level again.
I think may be T43/P Fan Control the same as T42/P. But Cpu is much hotter than T42 Dothan 400 FSB. So, T43 always noisy.

christopher_wolf · #33 Post by **christopher_wolf** » Sun Nov 13, 2005 11:14 pm

Not correct, it cannot get that much hotter than a T42p and the T43 isn't always noisey. It seems as though different models have slightly different behavior, from what I have seen...there are a similar number of posts descirbing T42/ps that are "Noisey" It may indeed be some sort of variation in how they are built and what shipment of Fans they got from the Supplier; not to mention the logic programming that they did..which might have undergone many revisions. I couldn't even reach "Level 3" fan noise today...Level 1, yes..after an hour; Level 2 came up under heavy processing loads on the CPU; I never heard of Level 3. In addition to this, not all the heat comes from the CPU. Any P Model will generate slightly more heat than a Normal T43 or T42 due to the Graphics Card...which I do think is cooled by the same fan as the CPU. This could mean that a T42p's Fan would behave as noisey as a T43p's if there was some sort of cooling threshold that the fan would "gloss" over, and this threshold stays the same for all the fans they put into the T43/ps and T42/ps, and remain on for quite awhile.

EDIT: I think I have an idea as to how to get the fan to be off, if indeed that is the goal; as per my post in a related thread, as shown here http://forum.thinkpads.com/viewtopic.php?t=17329 , it seems as if you can indirectly control the Fan through the Registry settings for the Power Manager and what NHC picks up. Does anybody think it would be a good idea to write a small program that would "cycle" the registry entries at set, user defined, intervals? Just a thought; let me know what you all think

2ND EDIT: I just had another thought, I know it is stated that undervolting doesn't affect the fan speed, but according to P=V*I...this should make a big difference after awhile. Doing some quick calculations, you will find that the reduction of power output, in joules/second (Watts) and propotional to the heat, is fairly significant. Over time, this should take down the temperature of the CPU quite a bit; yet the fan doesn't care. Why? Maybe, after a set, and in that thread aforementioned, threshold...it simply doesn't pay anymore attention to the temperature and just idles at the slowest possible state. Which is barely audible for me, as my typing, and even HDD at times, get louder. I have also noticed that the Fan is *very* efficient at maintaining a certain temperature and can, astoundingly quickly, cool the CPU off. I noticed a drop in temperature of 46 Degrees to 41 Degrees in 2.5 Minutes. That is pretty quick considering what the fan has to do, which is, correct me if I am wrong, cool the majority of the components in the Thinkpad. If it is indeed a steady state, as per some closed feedback control loop response, then there might be a reason for it. After all, you can model the Thinkpad and treat is as an LTI System and analyze the poles, roots, and Nyquist Diagram in Simulink & MATLAB (or by hand if one so desires

) and come up with the exact same behavior should you make certain assumptions about parameters that the Engineers designing it would have to take into account. Perhaps, by doing such things,we can get a better understanding of what is going on by theoretically infering things from the Control Systems Model.

As I was writing this, my fan just dropped another level and is now spinning very slowly as I can say for sure that the HDD is louder and my typing is the loudest; I am also in a very quiet room with no other acoustic disturbances, be they constant or intermittent. This is, by far, the quietest laptop I have heard. It ties with my Friend's T42...but the air is slightly hotter at a given CPU Clock Speed than mine; it is *highly* probable that , by changing the Fan Behavior, they actually made the T43 more efficient than the T42 at cooling down the CPU, given the Performance specs of the T43 over those of the T42. It is also possible that the T42s have more heat buildup and tolerate more of it than the T43s do. I haven't tested this out on the model yet; but I can say that, in this situation, it is better to have the fan spinning a little bit and cooling off what it is supposed to rather than letting heat buildup and using the Heatsink and other such things as a Buffer get very hot, which a Dothan 400 FSB might take well enough, until the Fan kicks in for awhile then spools down.

Socrates · #34 Post by **Socrates** » Wed Nov 16, 2005 1:03 pm

Does anyone know if I can control/disable the fan on my sister's (otherwise perfect) T40p? The original is busted and makes an obnoxious noise whenever it is running.... I'm waiting on the new fan FRU to arrive from IBM (only $34.00 shipping included from IBM...which is not too bad), but in the meantime she needs to use it in the college library. Any Ideas?

P.S. I know this is the t43/43p thread and I'm asking about a t40p...I just figured I would ask.

christopher_wolf · #35 Post by **christopher_wolf** » Wed Nov 16, 2005 1:23 pm

Besides somehow disconnecting the Fan; which would cause cooling/heating issues..I don't see any other way of directly controling it. You could get NHC on it and control the heat production that way so the fan doesn't have to kick in as often, and therefore wouldn't make that much noise. I think using NHC to do it would be a safer alternative.

EDIT: Please excuse me,

, NHC is Notebook Hardware Control...it used to be called Centrino Hardware Control; Cheers!

Socrates · #36 Post by **Socrates** » Wed Nov 16, 2005 3:08 pm

I had never heard of NHC (rookie! I know) but it looks good, so I'm downloading it now to give it a shot. Thanks.

akcpe · #37 Post by **akcpe** » Sun Nov 27, 2005 2:57 pm

Guys, everywhere i look for info about fan speed control on these T43's everyone has the same issue... where its too loud. I seem to have an opposite problem. My fan NEVER kicks into level 2 except on initial power up (once in windows its silenced, or level 1). When doing anything graphic or cpu intensive my temperature climbs with no increase in fan speed. I've had the cpu temp reach 87C and I'm worried that this isnt right.

System is a T43 2687-DDU (1.86GHz Dothan)

Anyone else experience this or have any ideas?

christopher_wolf · #38 Post by **christopher_wolf** » Sun Nov 27, 2005 3:05 pm

Ummmmm, 87 Degrees Celsius?

That is getting close to the 90 Degree Celsius Critical Temperature; I would have that serviced by IBM/Lenovo.

#39 Post by **Shimodax** » Sun Nov 27, 2005 4:46 pm

Please note this thread:
http://forum.thinkpads.com/viewtopic.php?t=17715

Also the discussion about the secret sensors here may be interesting:
http://www.thinkwiki.org/wiki/Talk:Prob ... _fan_noise

Enjoy

Markus

#40 Post by **Shimodax** » Sun Nov 27, 2005 4:55 pm

Btw, what I noted here while playing with my tool is that when the temp is in the in between area (not high enough to kick on, but not low enough to turn off) switching the power scheme in the Thinkpad Battery Manager turns it off until it hits the upper level again.

Also on the discussion about the secret sensors I described an observation about a one of those in particular (0xC1 sensor) which seems to be responsible many time for the fan to turn on even if the CPU is colder (again, see here: http://www.thinkwiki.org/wiki/Talk:Prob ... _fan_noise).

Markus

akcpe · #41 Post by **akcpe** » Mon Nov 28, 2005 2:35 pm

christopher_wolf

Yeah, 87 CELCIUS. With Shimodax's program i can kick it into speed 7, but it never does it on its own... bad hardware maybe?

christopher_wolf · #42 Post by **christopher_wolf** » Mon Nov 28, 2005 2:47 pm

Huh, that could be a problem with the cooling system in general or it could be that that temperature sensor is not displaying the right temperature.

akcpe · #43 Post by **akcpe** » Mon Nov 28, 2005 7:34 pm

I will be calling IBM about it... And trust me its gotta be 70-80C because it becomes extremely hot to the touch.

T43/T43p Fan Control

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