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51 Posts

12-04-2009

USA

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Question about T400s fan

2009-12-10, 2:35 AM

Hi, I have a question for T400s owners,

 

Have any of you noticed a "hiccup" in the t400s fan?  I can hear the fan (its not a quiet as some people say it is) and it clicks or hiccups kind of in a rhythmic pace every few seconds. I'm wondering if the fan is going bad

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260 Posts

07-03-2009

United States of America

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Re: Question about T400s fan

2009-12-10, 4:09 AM

 


wrote:

Hi, I have a question for T400s owners,

 

Have any of you noticed a "hiccup" in the t400s fan?  I can hear the fan (its not a quiet as some people say it is) and it clicks or hiccups kind of in a rhythmic pace every few seconds. I'm wondering if the fan is going bad


 

Mine does not have what you described.

 

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332 Posts

12-01-2009

Czech Republic

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Re: Question about T400s fan

2009-12-10, 12:51 PM
Well, i do not have this issue as well. My is really quiet or even not runing most of time.
----------------------------------------------------
Lenovo T440s, 20AQ0067MC, Windows 8.1 Pro x64 UEFI, Samsung 840 EVO SSD 250 GB, 8 GB RAM
Lenovo T430s, 2356LQG, Windows 8.1 Pro x64 UEFI, Intel 520 SSD 180 GB, 8 GB RAM
Lenovo T420s, 4171-6SG, Windows 8 Pro x64 UEFI, Intel 320 SSD 120 GB, 8 GB RAM
Lenovo T400s, 2808-CYG, Windows 7 Ultimate x64
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2 Posts

12-30-2009

France

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Re: Question about T400s fanoi

2009-12-30, 19:19 PM

Hello Samtoossi,

 

I have the exact same phenomenon on my brand new T400s (2808/D9G). It sound like there is some sort of strange mechanism to "respin up" the fan every few seconds : the fan speed is not constant at any time in fact, it spins a little down, then there is a little boost, and again and again.

I'm not sure this is an issue, even if I wondered at first... And now knowing I'm not alone...

Did you contact Lenovo for that ?

 

Thanls

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1041 Posts

03-10-2009

Michigan

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Re: Question about T400s fan

2009-12-30, 19:30 PM

The BIOS / Embedded Controller controls the fan speed*. When reporting presence or absence of fan "hiccups" it would be helpful to include your ThinkPad's BIOS version (press F1 at boot to enter BIOS Setup, the version is displayed there).

 

EDIT: As essaimel mentions below, the thermal profile settings (both BIOS and Windows I believe) also affect fan speed. It would be great if those without the fan hiccups would report what settings they are using. Thanks!

 

You could try flashing the latest BIOS: Burn the CD and boot from it to update the BIOS, I recommend NOT updating BIOS from within Windows.

 

Good luck!

-Frank

 

* Unless you have installed specialized software like TPFanControl. (It's safer not to use such software.)

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2 Posts

12-30-2009

France

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Re: Question about T400s fan

2009-12-30, 19:49 PM

For info : using BIOS 1.12 (latest, balanced thermal profile) and no tpfancontrol (I tried but it does exactly the same phenomenon for a specific fan speed).

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51 Posts

12-04-2009

USA

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Re: Question about T400s fanoi

2009-12-30, 20:07 PM

 


wrote:

Hello Samtoossi,

 

I have the exact same phenomenon on my brand new T400s (2808/D9G). It sound like there is some sort of strange mechanism to "respin up" the fan every few seconds : the fan speed is not constant at any time in fact, it spins a little down, then there is a little boost, and again and again.

I'm not sure this is an issue, even if I wondered at first... And now knowing I'm not alone...

Did you contact Lenovo for that ?

 

Thanls

 


No,  I just use TPFanControl to keep the fan off most of the time. I'll wait until something major happens and then include this issue into the mix when I call lenovo. Im kind of hesitant to get anything in this laptop replaced right now. If its the fan that needs to replaced, its not a big deal, but If its a motherboard issue there is no way in I'm going to replace it because there are many reports by other owners of annoying processor whine, unresolved random shutdowns, and melted speakers. I'm pretty happy with the current state of my laptop, thanks to TPFanControl :)
FYI, this looks very similar to the infamous "pulsing fan" problem that affected many of the earlier IBM Thinkpads. Its due to ACPI polling the fan RPM every few seconds (every 6 sec for my T400s). IBM eventually released a BIOS update which fixed the problem. If you run TPFanControl, you will see that the pulsing is only noticeable under fan speed 2 which constantly changes speed. Fan speeds 1, 3,4,5,6,7 don't have this problem (speed 3 kind of has it, but its no where as annoying). It could be that this is a common problem, but most people just don't hear it because of ambient noise or they're just not bothered by it. Hopefully, a BIOS update in the future fixes this problem.
If you decide to call Lenovo and have the fan replaced, let me know how it works out

 

 

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51 Posts

12-04-2009

USA

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Re: Question about T400s fan

2009-12-30, 20:17 PM

 


wrote:

The BIOS / Embedded Controller controls the fan speed*. When reporting presence or absence of fan "hiccups" it would be helpful to include your ThinkPad's BIOS version (press F1 at boot to enter BIOS Setup, the version is displayed there).

 

EDIT: As essaimel mentions below, the thermal profile settings (both BIOS and Windows I believe) also affect fan speed. It would be great if those without the fan hiccups would report what settings they are using. Thanks!

 

You could try flashing the latest BIOS: Burn the CD and boot from it to update the BIOS, I recommend NOT updating BIOS from within Windows.

 

Good luck!

-Frank

 

* Unless you have installed specialized software like TPFanControl. (It's safer not to use such software.)


 

 

I'm running BIOS 1.12 right now, but I had the same problem under 1.09 and 1.07

 

I'm currently using TPFanControl, but if I disable TPFanControl, I get the fan pulsing under all active cooling policies, (balanced, max perf, dynamically reduce fan noise). I'm running "Adaptive" most of the time. Needless to say, the problem is even worse under Max Performace

 

 

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1041 Posts

03-10-2009

Michigan

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Re: Question about T400s fan

2009-12-30, 20:35 PM

Very good information to know, thank you samtoossi! :smileyhappy:

 

So it now appears that recent BIOS versions and thermal profile settings do not affect whether or not the fan pulses. Then why does it happen for some T400ses and not others? Some possibilities:

  1. Different system boards / machine types? Please report 7 digit type model number from label on bottom.
  2. Different OS? Please report what you're running.
  3. Different users / environments? Some may simply not notice, while others are bothered.
  4. Variations in operating temperature: maybe some fans run at level 1, others at level 2 where pulsing is worse?
  5. Others?
---------

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51 Posts

12-04-2009

USA

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Re: Question about T400s fan

2009-12-30, 20:56 PM

Machine Type: 2801-CTO

OS: Windows 7 64bit RTM

Usage/Environment: Mostly at home, relatively quiet. Ambient temperature is 22 degrees. Laptop usually sits on a glass desk plugged to AC. Light usage. Mostly web browsing and Office apps.

Other: I notice the pulsing when in the BIOS setup (maybe this indicates that its not operating system dependent)

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