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22 Posts

10-26-2011

United States

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  • Message 941 of 1217

Re: T420s Fan noise Issue

2012-02-28, 19:29 PM

Mark-

 

A 20 minute loop is not sufficient for creating the problem all of us are experiencing. My fan gets stuck at 4000 RPM usually after about an hour or two of use. Engineering should try running multiple programs simultaneoulsy for 1.5 hours (to make the laptop work hard), and they will likely witness the fan stuck at 4000 rpm, even AFTER CLOSING OUT the programs.

 

I sent in my T420 a few months ago and all engineering did was run heavy load for 5 minutes and close it out, and of course the fan didn't get stuck. They also let the computer sit idle for 20 minutes and no problem occured.

 

Bottom line, the problem occurs after extended use, and it occurs intermittently, which makes it frustrating to isolate.

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8 Posts

08-02-2011

Chicago, IL

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  • Message 942 of 1217

Re: T420s Fan noise Issue

2012-02-28, 19:30 PM

I agree, why not have the engineers actually *use* the laptop over the course of a day or two?

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107 Posts

06-28-2011

Italia

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  • Message 943 of 1217

Re: T420s Fan noise Issue

2012-02-28, 21:27 PM

I can confirm that my fan runs at 3000 RPM using BIOS 1.05. I've recorded a video showing that level 4 means 3000 RPM on Linux. The video can be downloaded here:

https://dl.dropbox.com/s/bhg09u4jb7lpuhs/shell-20120228-1.webm?dl=1

 

What about restoring this speed, and trying saner fan control thresholds?

 

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17 Posts

01-18-2012

United States of America

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  • Message 944 of 1217

Re: T420s Fan noise Issue

2012-02-28, 22:39 PM

wrote:

I can confirm that my fan runs at 3000 RPM using BIOS 1.05. I've recorded a video showing that level 4 means 3000 RPM on Linux. The video can be downloaded here:

https://dl.dropbox.com/s/bhg09u4jb7lpuhs/shell-20120228-1.webm?dl=1

 

What about restoring this speed, and trying saner fan control thresholds?

 


Well done. I will check with my fan again to make sure whether it is fan depended, but under windows using TPFancontrol. If 3000RPM do exist for any types of fan on T420s. That's good. BTW, do you feel 3000RPM noisy?

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107 Posts

06-28-2011

Italia

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Re: T420s Fan noise Issue

2012-02-28, 23:07 PM

3000 RPM is almost quiet. It is not completely un-audible, however it is a huge improvement compared to 4000 RPM. And I mean huge!!

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17 Posts

01-18-2012

United States of America

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  • Message 946 of 1217

Re: T420s Fan noise Issue

2012-02-29, 3:27 AM

wrote:

3000 RPM is almost quiet. It is not completely un-audible, however it is a huge improvement compared to 4000 RPM. And I mean huge!!


:

 

I checked my fan using BIOS 1.05. Indeed as you said. The level 4 is 3000 RPM (correct for my previous inaccurate words, i did check all BIOS for the stuck situation, but not check all the fan level/speed). My full fan levels under BIOS 1.05 are

------------------

L0   0

L1   ~700

L2   ~2000

L3   ~3000

L4   ~3000

L5   ~4000

L6   ~4600

------------------

 

It is different from some other BIOS version. Interesting, right? It means the BIOS or ECP can control/set the fan level speed. So I fully support your idea. 3000 RPM is still a little noisy. It could be better if 2800RPM is possible.

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28 Posts

01-18-2012

Texas-USA

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  • Message 947 of 1217

Re: T420s Fan noise Issue

2012-02-29, 4:07 AM

 @Mark_Lenovo,

 

Are you saying that Testing for the fan issue on the T420s is complete?....And the verdict from the folks in Engineering is that the system is fine?  Or are they still reviewing the fan behavior?  Thanks.

 


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1 Posts

02-29-2012

Polska

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  • Message 948 of 1217

Re: T420s Fan noise Issue

2012-02-29, 6:38 AM
I been following this thread for a few weeks, because I was thinking about buying the T420, but I must admit that I got over, I cured myself of such purchase
Fortunately, that I came across this forum
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107 Posts

06-28-2011

Italia

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  • Message 949 of 1217

Re: T420s Fan noise Issue

2012-02-29, 8:24 AM

wrote:
I been following this thread for a few weeks, because I was thinking about buying the T420, but I must admit that I got over, I cured myself of such purchase
Fortunately, that I came across this forum

Lucky you!

 

I sincerely hope that engineers at Lenovo could get themself together and put an end to this crappy fan control algorithm, replacing it with something that makes sense.

 

Having a noisy piece of ice is incredibly annoying, and becomes even more irritating when the ice costs over a thousand quid.

 

Alessandro

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1 Posts

02-29-2012

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  • Message 950 of 1217

Re: T420s Fan noise Issue

2012-02-29, 20:47 PM

I really like lenovo trackpoints and I like the configuration of t420s. I've been waiting for a month or so to see if this fan noise issue gets fixed but I think i am just going to buy something else in a week if lenovo doesn't act responsibly and fix the noise issue.


I'm a computer engineer, its not that hard to fix fan speeds. Its probably going to be just a couple of line of code change, and the overhead of testing/engineer change order should not take more than a week tops (they probably have to track temperature with various loads etc.). Come on lenovo, stop being lazy.

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