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8 Posts

08-02-2011

Chicago, IL

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Re: T420s Fan noise Issue

2012-02-12, 14:44 PM

For those of you running tpfancontrol, have you noticed that sensor "x7f" and "bus" are reporting inaccurate temps? Here are the temperature sensor readings from tpfancontrol on my machine:

 

1 cpu 36°C

2 aps 16°C

4 gpu 16°C

6 x7d 16°C

7 bat 16°C

8 x7f 66°C

9 bus 64°C

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107 Posts

06-28-2011

Italia

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Re: T420s Fan noise Issue

2012-02-12, 18:08 PM

And to confirm that software is to blame, just unplugging AC instantaneously reduces the fan speed. The laptop was icy before and is cool after unplugging the power cord.

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163 Posts

07-02-2011

USA

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Re: T420s Fan noise Issue

2012-02-13, 14:11 PM

wrote:

For those of you running tpfancontrol, have you noticed that sensor "x7f" and "bus" are reporting inaccurate temps? Here are the temperature sensor readings from tpfancontrol on my machine:

 

1 cpu 36°C

2 aps 16°C

4 gpu 16°C

6 x7d 16°C

7 bat 16°C

8 x7f 66°C

9 bus 64°C


I think all of those sensors reporting 16C are inaccurate too. Watching the temperature readouts, do you observe that the only sensor reading which changes with the temperature is #1 (CPU)?

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8 Posts

08-02-2011

Chicago, IL

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Re: T420s Fan noise Issue

2012-02-13, 14:34 PM

Actually, the 16 degree readings are probably accurate - my apartment is pretty chilly :)

 

The odd thing is that tpfancontrol doesn't list the other sensors right away; those only came up after several suspend/resume cycles...

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87 Posts

01-25-2010

Canada

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Re: T420s Fan noise Issue

2012-02-13, 17:18 PM

Kltye:

 

You say you're getting all temp readngs, does your TPFC.ini look like this:

 

// ---------------------------------------------------------

// List of new 3 letter sensor names, delete leading // slashes to aktivat. Don't use capital letters for readability

// of temp icon.

// Liste von neuen Sensorname (jeweils 3 Buchstaben), zum

// Aktivieren die Schrägstriche löschen. Kleine Buschstaben

// wg. der Lesbarkeit im TempIcon gebrauchen.

 

//SensorName1=cpu

//SensorName2=aps

//SensorName3=pcm

//SensorName4=gpu

SensorName5=no5

//SensorName6=x7d

//SensorName7=bat

//SensorName8=x7f

//SensorName9=bus

//SensorName10=pci

//SensorName11=pwr

//SensorName12=xc3

 

Even after suspend/resume cycles, I'm still only getting reading 1 for cpu.  My old T61 would get all readings.

_______________________________________________________
T420s, i5-2520M @2.5, nVidia 4200m, 8GB DDR3, OCZ Vertex 3 Max IOPS 240GB SSD, Hitachi 320GB @7200rpm ulrabay, 8Pro x64
T61, Centrino Duo @1.8, GM965, 4GB PC2-5300 DDR2 @667MHz, OCZ Agility 120GB SSD, 7Pro x64
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107 Posts

06-28-2011

Italia

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Re: T420s Fan noise Issue

2012-02-14, 13:13 PM

@jasona: Could I ask if Lenovo got in touch lately? Sorry if I ask again, but you are the only one that might give us some news, since Lenovo seems to have lost contact with our world.

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22 Posts

10-26-2011

United States

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  • Message 887 of 1217

Re: T420s Fan noise Issue

2012-02-15, 7:58 AM

As mentioned, I sent my T420s into Lenovo and they claimed the fan was not getting stuck.

 

I've posted multiple times asking for suggested methods for getting the fan to stick at 4000, and once a surefire way has ben identified I could send my laptop in again with instructions for Lenovo engineers.

 

 But alas, everybody wants to discuss temperature thresholds and other irrelvant issues. I say irrelevant because all that matters at this point is getting Lenovo to recognize the fan problem, which they have yet to do. Our goal in this forum should be simple: prove to Lenovo that the problem is real. To do so, we need to identify a sequence of actions (video stremaing for 20 minutes, with three other programs running, that results in the fan getting stuck.

 

Let's keep the forum focused on getting a solution.

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107 Posts

06-28-2011

Italia

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Re: T420s Fan noise Issue

2012-02-15, 8:10 AM

wrote:

As mentioned, I sent my T420s into Lenovo and they claimed the fan was not getting stuck.

 

I've posted multiple times asking for suggested methods for getting the fan to stick at 4000, and once a surefire way has ben identified I could send my laptop in again with instructions for Lenovo engineers.

 

 But alas, everybody wants to discuss temperature thresholds and other irrelvant issues. I say irrelevant because all that matters at this point is getting Lenovo to recognize the fan problem, which they have yet to do. Our goal in this forum should be simple: prove to Lenovo that the problem is real. To do so, we need to identify a sequence of actions (video stremaing for 20 minutes, with three other programs running, that results in the fan getting stuck.

 

Let's keep the forum focused on getting a solution.


I am currently running Linux, which means that likely they would not aknowledge any pattern I might suggest. Identifying a pattern seems reasonable, however it is not an easy task, since the pattern might depend on testing conditions (e.g. lab temperature).

 

We discuss threhsolds since lifting those up may already give nice results, compared to the bad situation we are currently living in :)

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2483 Posts

04-08-2011

United States of America

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Re: T420s Fan noise Issue

2012-02-15, 14:10 PM

This thread is 6 months old and has 884 messages.  I'd say that is proof enough.

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163 Posts

07-02-2011

USA

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Re: T420s Fan noise Issue

2012-02-15, 14:32 PM

wrote:

As mentioned, I sent my T420s into Lenovo and they claimed the fan was not getting stuck.

 

I've posted multiple times asking for suggested methods for getting the fan to stick at 4000, and once a surefire way has ben identified I could send my laptop in again with instructions for Lenovo engineers.

 

 But alas, everybody wants to discuss temperature thresholds and other irrelvant issues. I say irrelevant because all that matters at this point is getting Lenovo to recognize the fan problem, which they have yet to do. Our goal in this forum should be simple: prove to Lenovo that the problem is real. To do so, we need to identify a sequence of actions (video stremaing for 20 minutes, with three other programs running, that results in the fan getting stuck.

 

Let's keep the forum focused on getting a solution.


Unfortunately, I doubt there is a surefire way of getting the fan stuck. There are probably too many factors that influence fan state, such as the ambient temperature, the temperature of various parts of the system board based on past heating, and the amount of dirt that has accumulated on the system board.

 

If we wanted to continue pursuing this, a sensible next step would be to use a hardware monitoring program to collect extended amounts of log data, allowing us to correlate the problem with specific factors. Unfortunately, as you've seen in the recent posts, the EC is not reporting several temperature sensor readings (such as the GPU reading) consistently.

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