Welcome to our peer-to-peer forums, where owners help owners. Need help now? Visit eSupport here.

English Community

ThinkPad NotebooksThinkPad: T400 / T500 and newer T series Laptops
All Forum Topics
Options

107 Posts

06-28-2011

Italia

2191 Signins

3793 Page Views

  • Posts: 107
  • Registered: ‎06-28-2011
  • Location: Italia
  • Views: 3793
  • Message 751 of 1217

Re: re: T420s Fan noise Issue

2011-12-14, 11:22 AM

I'll add some more questions that remain unanswered yet.

 

4) Are there different fan models?

5) Do different fan models behave differently with respect to speeds?

6) May changing fan help to reduce the noise?

 

Could anybody please answer back :)

Reply
Options

19 Posts

06-08-2011

Germany

42 Signins

105 Page Views

  • Posts: 19
  • Registered: ‎06-08-2011
  • Location: Germany
  • Views: 105
  • Message 752 of 1217

Re: re: T420s Fan noise Issue

2011-12-14, 12:07 PM

What? 4k RPM is OK when an external monitor is connected?! That's just crazy with such a bad fan.

Reply
Options

332 Posts

12-01-2009

Czech Republic

378 Signins

2497 Page Views

  • Posts: 332
  • Registered: ‎12-01-2009
  • Location: Czech Republic
  • Views: 2497
  • Message 753 of 1217

Re: re: T420s Fan noise Issue

2011-12-14, 12:37 PM
Hi, i use docking station and 22" LCD and this does NOT have any infuelnce. Higher CPU temp starts fan mostly to 3500 RPM (befor BIOS 1.30 update it was mostly to cca 4000 RPM). After temp goes down, fan RPM goes down as well, to cca 1980 RPM. And doesnt matter if i work with laptop only, or in docking station with external LCD. So generally it works on my device, true is, sometimes it really goes to "crazy" situation and fan RPM is high without any reason. Once i just closed the laptop, without any activity and fan RPM was cca 4000 RPM for whole night, without any reason. We have bought about 11 T420s devices, i checked another 2 devices and generally similiar problem, but eachdevice works little bit different, different fan RPM on different temp. Its really strange, but i am almost sure, there is NO just simple logic temp 1 means fan RPM 1, temp 2 means fan RPM 2, it just does not work this way. I think, iCore power management itself is quite complicated, that any another power management environment, like Lenovo Power Manager is really complicated. True is, if i compare my older T400s with this T420s, then T400s is really great (no noise, no heat, good performance), T420s is just not "Thinkpad quality expectation" device (in question of cooling system).
----------------------------------------------------
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
Reply
Options

1 Posts

12-11-2011

Germany

2 Signins

36 Page Views

  • Posts: 1
  • Registered: ‎12-11-2011
  • Location: Germany
  • Views: 36
  • Message 754 of 1217

Re: re: T420s Fan noise Issue

2011-12-14, 17:22 PM

Hi there.

 

So I own the T420s with the i7 and this fan, espacially it's high frequent noise which is always there at speeds >2000RPM, is driving me nuts. Every speed above 3k RPM just does a difference between annoying noisy and extremly annoying noisy.

 

At the office the notebook is always docked with one external 22" monitor (1.30 BIOS, CPU set to Balanced).

Considering the large amount of money I paid for this notebook (as my work depends on it) I would also have paid 100€ more for a good and quiet fan. The notebook is so wonderful but I wouldn't recommend it anyone else just because of the fan.

 

 

 

 

 

 

Cheers

Reply
Options

3538 Posts

07-12-2010

Malaysia

5065 Signins

104816 Page Views

  • Posts: 3538
  • Registered: ‎07-12-2010
  • Location: Malaysia
  • Views: 104816
  • Message 755 of 1217

Re: re: T420s Fan noise Issue

2011-12-15, 2:53 AM
@b4,

1. With external monitor connected causes extra "push" from the GPU thus generating heat.
2. I do not have that, I've been requesting that from engineering for quite some time now cause I want to know too.
3. It should be since both devices share the same BIOS. (Not confirmed)
4. Am not sure about that too.

@alexcriss,

1. Yes there are different fans
2. Not sure
3. Nope, the FRU part is going to be the same.

@All,

I would really need a customer's machine which has this fan stuck at 4k RPM despite idle, lower than 45c CPU core temp and not plugged into external monitors.

Engineering do not have a faulty unit at their place and thus they are unable to progress further.

//JameZ
Reply
Options

107 Posts

06-28-2011

Italia

2191 Signins

3793 Page Views

  • Posts: 107
  • Registered: ‎06-28-2011
  • Location: Italia
  • Views: 3793
  • Message 756 of 1217

Re: re: T420s Fan noise Issue

2011-12-15, 8:51 AM

@JameZ: Thanks for the answers, much appreciated :)

 

Let me just ask another one: do the different fan have the same FRU, or I would get the same one just because I have that one. In other words, what if I order a different fan, knowing that it is mounted on other T420s (and hence it is one of the right models for this laptop). Hope I was clear!

 

I know you are waiting for U.S. based people to volunteer, but if at some point other countries are considered I'll gladly send mine laptop in from Italy.

 

Cheers,

Alessandro

Reply
Options

49 Posts

08-10-2011

Germany

132 Signins

405 Page Views

  • Posts: 49
  • Registered: ‎08-10-2011
  • Location: Germany
  • Views: 405
  • Message 757 of 1217

Re: re: T420s Fan noise Issue

2011-12-15, 9:29 AM

Wath I noticed is that the new fan has other stepps wenn using TPFcontrol. By leeting the Bios control the fan, I do not know if there was a differend, I dont remember that (it was Month ago ;) )

Reply
Options

1 Posts

12-15-2011

France

96 Signins

146 Page Views

  • Posts: 1
  • Registered: ‎12-15-2011
  • Location: France
  • Views: 146
  • Message 758 of 1217

Re: re: T420s Fan noise Issue

2011-12-15, 15:13 PM

Hi,

 

I bought this laptop 1.5 month ago. Since then I didn't notice much the fan noise, but lastly, the fan started to make a click sound like if a bearing is broken... Asking google lead me here.

 

I mostly use my laptop under Linux, so I can't use proprietary windows-only diagnostic tools, but I recently installed sensord to graph fan speed and CPU temperature. I also upgraded BIOS to 1.30 yesterday.

 

I noticed that I could change the fan speed by echoing a number between 0 and 7 into /proc/acpi/ibm/fan

I checked the fan speed by reading /sys/class/hwmon/hwmon1/device/fan1_input

 

Here is what I measured:

 

Level 0  fan is turned off

Level 1  fan speed: 1956 RPM

Level 2  fan speed: 1986 RPM (+40)

Level 3  fan speed: 3520 RPM (+1534)

Level 4  fan speed: 3782 RPM (+262)

Level 5  fan speed: 4000 RPM (+218)

Level 6  fan speed: 4633 RPM (+633)

Level 7  fan speed: 4633 RPM (+0)

Level full-speed  fan speed: 5410 RPM (+777)

Level disengaged  fan speed: 5410 RPM

 

 

I'm curious about why there is not much difference between level 1 and 2, and a huge gap between level 2 and 3... Can anyone from lenovo answer this ? Can this be a bug in the firmware tables ?

 

I'd like to have a level 2 to, say, 2500 RPM, that would make much less noise than level 3.

 

 

 

 

Reply
Options

23 Posts

12-17-2011

Germany

257 Signins

377 Page Views

  • Posts: 23
  • Registered: ‎12-17-2011
  • Location: Germany
  • Views: 377
  • Message 759 of 1217

Re: re: T420s Fan noise Issue

2011-12-17, 21:40 PM

Hello,

my T420s shows a similar behavior. It does not get actually stuck at 4000rpm, but the fan speed levels I get from my ThinkPad have pretty big steps.

Today I ran a stresstest (Prime95 + FurMark) and used HWinfo64 to check the fan speed.

0% load: ~43°C / ~1950RPM

100% load: 90°C / 4030 RPM

 

So far it seems pretty equal to the results zundog came up with. But then I put the TP back to 0% load and watched the temperature and the fan speed:

It took the system around 5 Minutes to be back at constant 43°C but the fan stayed on 4000RPM for about 8 Minutes. After that it went down to 3500RPM and then finally back to ~1950RPM.

 

So my question would be: Why the h... does the fan only enter 3 distinct speed levels and not something in between?

Next question: While typing this answer the temperature is deviating between 43 and 45°C but the fan almost immediately speeds up to pretty annoying 3500RMP. Then after a few minutes it seems to "realize" that there actually is not that much heat to be carried away and slows down again. But then it is enough to scroll two or three times on e.g. facebook to bring the fan up to 3500RPM again.

 

System: Core i5 2520M

BIOS: 1.30

Latest drivers and software

CPU mode: Maximum turbo / balanced fan control

 

I understand that setting maximum turbo will increase the heat output and therefore the fan speed under heavy load. But shouldn't the powermanagement be able to keep the fan at low speeds while the cpu isn't under load? Setting a lower performance mode decreases the fan noise, but I need this performance boost regularly for a few seconds.

Reply
Options

49 Posts

08-10-2011

Germany

132 Signins

405 Page Views

  • Posts: 49
  • Registered: ‎08-10-2011
  • Location: Germany
  • Views: 405
  • Message 760 of 1217

Re: re: T420s Fan noise Issue

2011-12-17, 22:19 PM

 

namelessrabbit 

 

wrote


"Hello,

my T420s shows a similar behavior. It does not get actually stuck at 4000rpm, but the fan speed levels I get from my ThinkPad have pretty big steps.

Today I ran a stresstest (Prime95 + FurMark) and used HWinfo64 to check the fan speed.

0% load: ~43°C / ~1950RPM

100% load: 90°C / 4030 RPM

 

So far it seems pretty equal to the results zundog came up with. But then I put the TP back to 0% load and watched the temperature and the fan speed:

It took the system around 5 Minutes to be back at constant 43°C but the fan stayed on 4000RPM for about 8 Minutes. After that it went down to 3500RPM and then finally back to ~1950RPM."

 

 

 

This perfectly describes the behavior of my Thinkpad too. Plus the unmotivated upspinning sometimes for example wen i watch Videos 

 

Reply
Forum Home

Community Guidelines

Please review our Guidelines before posting.

Learn More

Check out current deals!

Go Shop
X

Save

X

Delete

X

No, I don’t want to share ideas Yes, I agree to these terms