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34 Posts

04-27-2011

San Francisco, CA

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  • Message 811 of 1217

Re: T420s Fan noise Issue

2012-01-16, 4:39 AM
Get your act together Lenovo. I have been doing my best communicating with your representatives here and on the phone. There is more than enough evidence that there is something wrong in your bios code. I am now sitting here with a laptop at 37*C and the fan spinning away at 4000rpm. The event viewer is throwing ACPI errors saying the BIOS needs to be fixed. This is ridiculous. I have been patiently waiting a year for you guys to solve this problem. This is not the Thinkpad reliability and service I have heard about. I, and as I'm sure a lot of people here, are at their wits end about this issue!
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2 Posts

01-16-2012

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  • Message 812 of 1217

Re: T420s Fan noise Issue

2012-01-16, 10:15 AM

Hey,

 

i've running into the same issues. I've previously owned a t410s , and never observed any fan problems with it.

I've bought a t420s (product_no: 4173L7G, bought in november 2011), and facing the sam issue. if i open my IDE (eclipse), putty and let a local apache server run (xampp) ,outlook, two instances of firefox, i've got a processor-load of 6% when running these applications. I've updated to BIOS version 1.31 and updated the new power manager (3.65) too, but still the same. If i boot my notebook, it's okay, no fan noise. after some minutes, the fan is very loud and stays until 5 minutes are over. i don't understand this issue. i don't do any graphical editing here, where the gpu or cpu is needed.

 

It would be great to get an fix here. that's not the quality i'm accustomed from lenovo.

 

Best regards,

Ramo

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143 Posts

11-15-2009

Stockholm

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  • Message 813 of 1217

Re: T420s Fan noise Issue

2012-01-16, 10:25 AM
I would actually argue that spinning the fan at high RPMs for five minutes and then settling down would be normal behavior. The computer is probably running hot the first few minutes of booting, and needs to cool down. What happens after 5 minutes? Does it stay quiet then, until you run another processor-intensive application?

Most of us who have this problem get a fan that spins up to 4000 RPM and then it gets stuck there - i.e. it never settles back down.
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2 Posts

01-16-2012

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  • Message 814 of 1217

Re: T420s Fan noise Issue

2012-01-16, 21:42 PM
Hi, yes. my fan is slowing down for lets say 2-4 Minutes. i was surfing on the web, and it slows down. now i'm here on that forum and write an answer to you, and the fan is again very loud, and i'm just writing to you, didn't opened any additional application. that's what makes me so mistrustful. the fan is now running over 3 minutes... cpu is at 3% (no hot/warm air stream from the cooler). on my old t410s i never had such problems. the fan was just loud if i started watching a movie while in parallel my development environment was up (apache, tomcat, solr, ) and working. this is no comparison to this behaviour. now, after 6 minutes i can't hear the fan. let me wait some minutes, and it will start again.... Best regards, Ramo
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163 Posts

07-02-2011

USA

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  • Message 815 of 1217

Re: T420s Fan noise Issue

2012-01-17, 6:38 AM

wrote:
Get your act together Lenovo. I have been doing my best communicating with your representatives here and on the phone. There is more than enough evidence that there is something wrong in your bios code. I am now sitting here with a laptop at 37*C and the fan spinning away at 4000rpm. The event viewer is throwing ACPI errors saying the BIOS needs to be fixed. This is ridiculous. I have been patiently waiting a year for you guys to solve this problem. This is not the Thinkpad reliability and service I have heard about. I, and as I'm sure a lot of people here, are at their wits end about this issue!

I don't think the ACPI errors in the event log have anything to do with the fan noise problem. I got those on my old T61 too, and I never had this kind of fan controller problem on that one. 

 

Right now, the fan is blowing cold air at 4000RPM with a CPU temperature of 38C. It's been doing this for about an hour now, and I don't expect it to stop unless I sleep or reboot. Yet, I haven't had any ACPI events in my log for a week.

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163 Posts

07-02-2011

USA

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  • Message 816 of 1217

Re: T420s Fan noise Issue

2012-01-17, 6:45 AM

X2222 and _ramo: It sounds like both of you are experiencing normal fan behavior, although it's annoying because the T420s fan is loud compared to the size of the laptop. BIOS updates have tweaked the fan behavior, but unfortuantely there isn't really  any way to fix those issues. If the laptop runs hot, the fan must run fast.

 

If your laptop is running very cool and the fan sometimes gets stuck on a high speed blowing cold air until a sleep or reboot...then start complaining to Lenovo. This could be fixed with a BIOS updates, but none of the BIOS updates to date have affected this behavior. It was present on both the older and newer BIOS releases.

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6 Posts

01-07-2012

Denmark

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  • Message 817 of 1217

Re: T420s Fan noise Issue

2012-01-17, 11:07 AM

My fan have been spinning at 4000RPM for hours, and all I've had open is a PDF and a web browser in the background (CPU load is 0 - 1 %, nothing intensive going on in the browser). Curious as to whether the fan was stuck at 4000RPM regardless of temperature, I decided to try and put the laptop in my fridge (still running). After a few minutes it dropped to 2000RPM. Took the laptop out again and after another few minutes the fan jumped up to 3500RPM. And I'm guessing It'll soon go up to 4000RPM again. 

So the fan isn't stuck. The temperature just never drops low enough for the fans to spin down. I think this could be solved by raising the threshold, as it has already been sugested.

 

Computer is an i5 with Intel HD Graphics 3000 BIOS 1.31 running Linux 

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12 Posts

09-26-2011

Frankfurt, Germany

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  • Message 818 of 1217

Re: T420s Fan noise Issue

2012-01-17, 11:26 AM
hi guys,

as i said before, my fan isn't very noisy and with my CPU always being more than 55oC (even when idle) it spins above 3500RPM , but it never disturbs me much.

My i7 2620 in Turbo Mode (with Nvidia NVS 4200M) runs quite hot as it seems, therefore the fan behaviour makes sense.

I can try to test with putting the laptop outside in the cold to see if it goes down.

The heating on the T420s is far from good though, I wouldn't mind having better and faster fan.
If I run some heavy applications (vmware images with servers, virus scan or 3D stuff) the CPU reaches 90oC easily and then goes into throttling mode, hence I am loosing performance.

I can let you know if the fan goes down when the CPU is really cold but as of now I have never managed to get it under 45oC even when fully idle.

//Matt
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23 Posts

12-17-2011

Germany

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  • Message 819 of 1217

Re: T420s Fan noise Issue

2012-01-17, 12:48 PM

"Most of us who have this problem get a fan that spins up to 4000 RPM and then it gets stuck there - i.e. it never settles back down."

 

But also the absolutely unnecessary upspinning of the fan while surfing on the net must be fixed as it is extremely annoying.

And since those problems are both pretty much down to the fan controller also people who don't have the stuck fan also deserve a fix/should be considered while fixing it.

 

But I'd like to get some reports about the idle temp of your T420s'. Because even with an average cpu utlization of 5% my T420s runs at ~45°C. Is that normal or should I check the cooling system? Room temperature is around 21°C.

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49 Posts

08-10-2011

Germany

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  • Message 820 of 1217

Re: T420s Fan noise Issue

2012-01-17, 13:08 PM

Hy.

my t420s is idle at ~40-45°C a external Monitor via VGA make no big diverent.

 

is the CPU temp. lower than 42°C the fan goes down to 2k rpm

 

Now with Internet radio, Qutlook, PDF-reader, and the browser it stays at 45-55°C with a fan speet of 2k - 3.5k.

 

 

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