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ThinkPad NotebooksThinkPad: T400 / T500 and newer T series Laptops
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62 Posts

06-08-2011

USA

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Re: T420s Fan noise Issue

2012-03-15, 0:28 AM
David99, that describes my problem perfectly. I use the Lenovo dock which means that the nvidia chip is always running. I tried setting the bios to integrated only but it doesn't appear to be able to power my 1 dvi external monitor using the dock. Otherwise, the laptop is exceptionally quiet on battery power with the nvidia turned off.
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49 Posts

08-10-2011

Germany

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  • Message 972 of 1217

Re: T420s Fan noise Issue

2012-03-15, 7:23 AM

Hy 

I juse the dock to and I have the Nvidia logo in the powermanager only wehn I juse Photoshop. Or who can I chek with Grapic chip is working ? 

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73 Posts

03-08-2008

Slovakia

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Re: T420s Fan noise Issue

2012-03-15, 8:20 AM
Hi,

I'm also using dock so I have the same issue. After buying external monitor and DP cable I found that DVI and DP are active only with NVIDIA so from this point I was forced to use external monitor over analog cable as I want silent system. I didnt expected this. Now I wish rather to have model with integrated gpu only.
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73 Posts

03-08-2008

Slovakia

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Re: T420s Fan noise Issue

2012-03-15, 8:22 AM
Open NVIDIA control panel (righ click to desktop - nvidia contro panel) and here in upper menu you could check to display gpu activity icon. I cannot remember exact menu now.
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163 Posts

07-02-2011

USA

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Re: T420s Fan noise Issue

2012-03-15, 14:09 PM

wrote:
Hi,

I'm also using dock so I have the same issue. After buying external monitor and DP cable I found that DVI and DP are active only with NVIDIA so from this point I was forced to use external monitor over analog cable as I want silent system. I didnt expected this. Now I wish rather to have model with integrated gpu only.

david99: Integrated GPU won't help. I have integrated GPU only and fan is spinning at 4000RPM most of the time, even with temperatures as low as 32C.

 

david99: It sounds like the problem you're experiencing is different from the main fan noise problem. Your fan spins loudly when you're generating a lot of heat, and it quiets down when you're generating less heat. Our problem is that the fan will start spinning at 4000RPM and not slow down, even when heat generation is low.

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62 Posts

06-08-2011

USA

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Re: T420s Fan noise Issue

2012-03-15, 15:53 PM
Since it appears that there are a few different problems with the T420s fan noise, perhaps it would help Lenovo if one person put together one post with the different types of fan issues that users are experiencing.

The issues that people are experiencing are almost identical and reproducible. Perhaps it would help to have one post that makes this clear to Lenovo. Any volunteers to organize this info?
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16 Posts

11-15-2008

Saskatoon

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  • Message 977 of 1217

Re: T420s Fan noise Issue

2012-03-15, 16:20 PM

I think Lenovo has all the information they need

 

There are some reports in this thread of a user who sent his machine to be tested by their engineers

 

What else would they need?

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2483 Posts

04-08-2011

United States of America

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Re: T420s Fan noise Issue

2012-03-15, 16:23 PM

wrote:

 

What else would they need?


I can't really say because it would be against forum laws and would get removed.

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2483 Posts

04-08-2011

United States of America

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Re: T420s Fan noise Issue

2012-03-15, 16:26 PM

wrote:
david99: Integrated GPU won't help. I have integrated GPU only and fan is spinning at 4000RPM most of the time, even with temperatures as low as 32C.


That seems to rule out the GPUs.  Sounds like it's the actual fan or the software controlling it.  Likely a BIOS flaw or a flaw in the Windows power managment drivers from Lenovo.

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107 Posts

06-28-2011

Italia

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Re: T420s Fan noise Issue

2012-03-15, 16:34 PM

IT IS A BIOS FLAW! WHAT THEY NEED IS A BIOS FIX

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