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62 Posts

06-08-2011

USA

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Re: T420s Fan noise Issue

2012-02-22, 4:41 AM
Yes, I just checked. It's set to nvidia Optimus. The strangest thing is that the fan runs at full blast while in bios. Is that normal?
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2483 Posts

04-08-2011

United States of America

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Re: T420s Fan noise Issue

2012-02-22, 5:25 AM

wrote:
Yes, I just checked. It's set to nvidia Optimus. The strangest thing is that the fan runs at full blast while in bios. Is that normal?

When I said Nvidia, I meant Discrete.  The NVIDIA GPU is the Discrete gpu.

 

As for the fan speed while in the BIOS, that happens on many models.  Yes, it's annoying. I consider it a bug.

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62 Posts

06-08-2011

USA

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Re: T420s Fan noise Issue

2012-02-22, 17:37 PM
Interesting. On discrete bios setting the idle temp on desktop is slightly higher at about 55c while on Optimus it's idle at about 47c (both examples using the Lenovo dock plugged in).
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9380 Posts

11-27-2007

Slovakia

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Re: T420s Fan noise Issue

2012-02-22, 20:26 PM

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1336 Posts

12-20-2011

Malaysia

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Re: T420s Fan noise Issue

2012-02-23, 0:02 AM
Not surprise if the discrete GPU only is causing more heat than when on Optimus since its optimize to use the Intel GPU when there is a less usage of GPU.

Anyone tried reapplying the thermal paste?

*Non Lenovo employee*

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2483 Posts

04-08-2011

United States of America

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Re: T420s Fan noise Issue

2012-02-23, 4:28 AM

wrote:

Anyone tried reapplying the thermal paste?

Most of these machines are relatively new and under warranty.  Wouldn't that void the warranty?

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34 Posts

04-27-2011

San Francisco, CA

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Re: T420s Fan noise Issue

2012-02-23, 5:02 AM
For me the issue isn't even high temperatures. The fan will get stuck at 4000RPM and stay there even as my cpu temps get below 37*C.
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107 Posts

06-28-2011

Italia

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Re: T420s Fan noise Issue

2012-02-28, 9:00 AM

@Mark_Lenovo: any news about isolating the problem?

 

Besides, what about asking for an intermediate fan speed, for example 3000 RPM? Could you pass the question to the engineering group? I think it might be a reasonable design choice, since the gap between 2000 RPM and 4000 RPM is far too wide, and I'd love some feedback from Lenovo about it :smileyhappy:

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3 Posts

02-28-2012

Saarbrücken

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Re: T420s Fan noise Issue

2012-02-28, 13:44 PM

I recently bought a new T420s and I also have this problem. Very annoying, grr...

I got this problem under Windows7 as well as under Ubuntu Linux.

Unfortunately, this issue discharges the battery very fast, which sometimes prevents me from working.

I also got a lot of evil eyes within meetings.

Is there any chance to get this issue solved within the next weeks?

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163 Posts

07-02-2011

USA

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Re: T420s Fan noise Issue

2012-02-28, 15:23 PM

wrote:

I recently bought a new T420s and I also have this problem. Very annoying, grr...

I got this problem under Windows7 as well as under Ubuntu Linux.

Unfortunately, this issue discharges the battery very fast, which sometimes prevents me from working.

I also got a lot of evil eyes within meetings.

Is there any chance to get this issue solved within the next weeks?



magic: When my fan was stuck at a high speed, I never noticed that the battery was discharging especially quickly. It will discharge a little faster, but not at an extreme rate.

 

Also, this fan noise issue is rarely experienced by users who are on battery power. (It mostly happens on AC power).

 

This makes me suspect that there's a runaway process or a power manager setting causing your processor to run too fast, generating heat and making the fan spin loudly. I would look into this.

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