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8 Posts

01-04-2012

USA

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Re: T420s Fan noise Issue

2012-02-06, 15:38 PM
@alexcriss, Here is the status I received from Mark_Lenovo on Tuesday 1/31: """ We have it and have made a bit of progress. We pulled out the Linux drive and set aside for safe keeping and installed a Win 7 factory preload drive. Initially all was well, but after applying all Windows updates and applicable Lenovo updates, we are seeing the system CPU temp increase while idle and then the fan ramp up and run at higher speed, and then would settle back down. The engineers are still testing. """ They still have the laptop. I also asked Mark to ask engineering to boot Linux to see the 4000 RPM first hand. He said he'd pass along the request.
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107 Posts

06-28-2011

Italia

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Re: T420s Fan noise Issue

2012-02-06, 16:37 PM

Thanks for the update!

 

I really hope that they boot up your linux install to see the level of annoiance they are pushing on us.

I still wonder how much it takes to lift up those thresholds a bit for a quiter life.

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23 Posts

12-17-2011

Germany

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  • Message 863 of 1217

Re: T420s Fan noise Issue

2012-02-06, 23:22 PM

Everything I discovered in the recent time points toward the already suspected low tresholds, because currently it's freezing cold outside and my roomtemperature is a few degrees lower, too. By now I can watch a 1080p Youtube-Video and it takes the fan a few minutes to kick in, but as soon as I stop the video the fan weill spin down to absolute silence with almost no delay. I think I never saw the temperature of the second core go above 40°C while playing the video, maybe this is the borderline where things start to get serious. Can anyone confirm this?

(Powermanagement set to "Maximum battery life" but on AC)

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163 Posts

07-02-2011

USA

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Re: T420s Fan noise Issue

2012-02-07, 3:43 AM
When the room temperatures got colder here, my CPU fan got stuck at 4000RPM less frequently... but it still happens sometimes. Putting the computer in sleep mode and immediately waking it somehow clears the condition that caused the fan to go up to 4000RPM, because I have many minutes of silence after doing this.
So, no, I don't think this is a simple problem of adjusting a CPU temperature threshold. However, it does seem like colder temperatures create a condition where the problem is less likely to manifest itself.

wrote:

Everything I discovered in the recent time points toward the already suspected low tresholds, because currently it's freezing cold outside and my roomtemperature is a few degrees lower, too. By now I can watch a 1080p Youtube-Video and it takes the fan a few minutes to kick in, but as soon as I stop the video the fan weill spin down to absolute silence with almost no delay. I think I never saw the temperature of the second core go above 40°C while playing the video, maybe this is the borderline where things start to get serious. Can anyone confirm this?

(Powermanagement set to "Maximum battery life" but on AC)


 

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2483 Posts

04-08-2011

United States of America

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Re: T420s Fan noise Issue

2012-02-07, 19:30 PM

Mod removal in 3...2...1...

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4096 Posts

01-05-2008

Germany

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  • Message 866 of 1217

Re: T420s Fan noise Issue

2012-02-07, 18:57 PM

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107 Posts

06-28-2011

Italia

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  • Message 867 of 1217

Re: T420s Fan noise Issue

2012-02-07, 19:55 PM

Wow, epic fail on my part.

 

It seems that my reading of forum rules is badly broken, I do apologise for this!

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5 Posts

01-19-2012

Poland

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  • Message 868 of 1217

Re: T420s Fan noise Issue

2012-02-07, 23:54 PM

wrote:
When the room temperatures got colder here, my CPU fan got stuck at 4000RPM less frequently... but it still happens sometimes. Putting the computer in sleep mode and immediately waking it somehow clears the condition that caused the fan to go up to 4000RPM, because I have many minutes of silence after doing this.
So, no, I don't think this is a simple problem of adjusting a CPU temperature threshold. However, it does seem like colder temperatures create a condition where the problem is less likely to manifest itself.

While I can't say who is right or wrong about this being purely a problem with tresholds, the fact that suspend/hibernate helps does not disprove the hypothesis that this is a pure treshold problem. The built-in hysteresis of fan control algorithms means that the same temperature results in a different fan speed depending whether the system comes from a colder or hotter state. During sleep, it is quite probable that the alogrithm is reset and assumes that it is coming from a cold state, hence starting at a lower fan speed. I noticed that the same happens if one takes temporarily the control away from the bios by software and then surrender control to the bios.

 

If this is a treshold issue, then the deciding factor that would determine whether the fan eventually spins down after a hot state is the temperature of the surfaces surrounding the CPU, which mainly depend on (i) the room temperature and (ii) on the heat accumulation in the laptop due to the history of the CPU/GPU utilization. I would say that this looks rather consistent with the triggering events reported in this thread (warm environment and 1/2-2 hrs of prior use), so I am also inclined to believe that this is indeed a threshold issue. The T420s would not be the first ThinkPad with overly conservative tresholds either...

Personaly I do not mind using thinkfan (or whatever software control), but like many others I would feel a bit more comfortable if Lenvovo would give its official blessing for somewhat increased thresholds.

 

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17 Posts

01-18-2012

United States of America

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Re: T420s Fan noise Issue

2012-02-08, 3:35 AM

Lenovo should indeed pay the salary for ThinkFan and TPFancontrol guys. Without it, I could have returned my item already!

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22 Posts

05-05-2008

Marburg, Germany

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  • Message 870 of 1217

Re: T420s Fan noise Issue

2012-02-08, 10:09 AM

:heart: lovely idea :smileyhappy:

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