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16 Posts

06-06-2018

Germany

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-08, 11:24 AM

We should never stop posting here until it get fixed.   

Why is it 40 deg C when it starts to whine like a banshee?  

 


Thats the most mind boggling thing of it all. This must be a bug of some sort. All of this is just so disappointing. I love this laptop and it was a big purchase for me but still the fan noise really ruins a lot.

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8 Posts

09-10-2018

United States of America

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-17, 17:17 PM

I am not sure if it has worked for anyone else, but the most recent update for the computer (I don't think it was a BIOS update, one of the regular, "you need to update your computer" prompts) seems to have fixed the problem. Since the update a few days ago the fan is not noisy! A miracle?!

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2 Posts

09-14-2018

Finland

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-20, 7:08 AM

No miracle in my computer. I tested to put temporarily my computer's CPU 98 % -> 100 %.

Same fan noise acceleration is happening still. :(

 

Has anyone else found solution for this fan problem?

 

 

 

 

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15 Posts

05-21-2018

Poland

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-20, 7:18 AM

It does nothing to me neither .

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8 Posts

10-01-2018

United Kingdom of Great Britain and Northern Ireland

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-22, 13:44 PM

 wrote:

 

 

Has anyone else found solution for this fan problem?


No and, barring a breakthrough with the nbfc guys to work out how the heck this embedded computer functions since a number of people have tried to crack the 2017/2018 Lenovo ideapad/yoga case with nothing to show for it, I'm starting to think there'll never be one.  I've learned to live with it, but my worry is that the longevity of the fans is going to be shortened by the constant fluctuations in rotation speed.  I'd be quite happy if they just made the rotation speed adjustments a bit more sane!

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8 Posts

09-10-2018

United States of America

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-22, 14:09 PM

 wrote:

I am not sure if it has worked for anyone else, but the most recent update for the computer (I don't think it was a BIOS update, one of the regular, "you need to update your computer" prompts) seems to have fixed the problem. Since the update a few days ago the fan is not noisy! A miracle?!



now my computer's fan has gone noisy again. It is very strange to me that it would be quiet, like a normal computer for about 5 days and then start going wild again. very frustrating.

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9 Posts

10-25-2018

United Kingdom of Great Britain and Northern Ireland

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-25, 13:13 PM

I've just got the 720S-14IKB, core I7-8550U and had the same issue of terrible fan noise. Seems its caused every time the CPU ramps up to turbo speeds.

 

I used the setting described earlier in this thread of setting the 'Maximum processor state' to 98% which works great to reduce fan noise. However, I was disappointed with the fact it meant the CPU was limited (no turbo). Whilst poking around in the BIOS I noticed an option called 'Intel Dynamic Platform and Thermal Framework Setting'. You can Google it for details about what it does but I decided to use that instead and seem to have had some success.

 

With the setup described below, I have a quiet machine generally but, when needed, the processor can ramp up to turbo speeds (of course, you will get fan noise at that point but it ramps down very quickly).

 

Here's what I did:

  • Made sure I had the latest BIOS (not sure if the option was there before the update or not).
  • Ensure 'Intel Dynamic Platform and Thermal Framework Setting' is enabled in BIOS.
  • Boot the laptop and go into Advanced Power Settings (Control Panel\Hardware and Sound\Power Options\Edit Plan Settings -> change advanced power settings)
  • In 'Intel Dynamic Platform and Thermal Framework Setting', under 'Config TDP Level' changed the TDP for both battery and plugged in to be 18.8 @1.8GHz (was 18.8W@2.0GHz). Of course, if you have a different processor your options may be different. Essentially, drop it down one level. (Side note: I wonder if this is the crux of the issue as my CPU is 1.8GHz but Windows/Intel drivers were using 2.0GHz; hence poor thermal management??)
  • My 'Maximum Processor State' under 'Processor power management' is set to 100% (i.e. not the 98% workaround).
  • I also have 'System cooling policy' set to passive for both battery and plugged in (not sure this is necessary for plugged in but not experimented enough).

Now, my laptop is quiet in normal operations -> including browsing, Youtube @1080p, local video playback, etc. It ramps up when needed (and is noisy) but that is under much more demanding tasks. You can check if your CPU ramps up by, for example, zipping a large binary file (I zipped up a 700MB .avi file as a test) -> CPU went up to >3.5GHz with fans going and then, shortly after finishing, the fan turned off and went quiet.

 

I'd love to know if this works for others. I've tested for a few hours now on both battery and plugged in.

 

Also, chip in if you know anything about the 'side note' I mention above.

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15 Posts

05-21-2018

Poland

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-25, 16:50 PM

It works for me  in i5 version , I droped down TDP  to 1,6 Ghz , but paradoxically the processor performance is better when You remain max proc at 98% .  Than it is almost as fast as with 100%  max cpu and TDP 1,8 Ghz .  Thank You dpadel20 for Your contribution.

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22 Posts

01-31-2018

Netherlands

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Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-29, 11:34 AM

Thanks dpatel20.

I did exact the same as you did, it makes a small difference but unfortunally still a issue on my laptop.
@Lenovo; any update on your side?

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1 Posts

10-30-2018

Germany

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  • Message 170 of 225

Re: Ideapad 720S-14IKB fan noise/cycling

2018-10-30, 17:06 PM

I cannot find the Intel Dynamic Platform and Thermal Framework Setting.. I downloaded the newest bios driver etc.. What could the problem? I'm using a Lenovo IdeaPad 720s.

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