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8 Posts

12-19-2019

US

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Re: Yoga C940 4k - Fan runs constantly

2020-01-29, 15:42 PM

What about when it's just plugged in and not "pushing it hard", maybe just with a single browser tab open? The fans on mine wouldn't shut off even when idle when plugged in, on any power mode and any fan mode. And then doing anything at all would rev them up to full blast.

 

I'm also curious as to what the difference is between power draw on the 1080p vs 4k screen. It seems most people complaining about fan noise have the 4k model. Since it reduces battery life by 15-20% I wonder if that's part of the issue too.

 

And also if the BIOS update someone posted about recently has had any effect as well. I already returned mine so I can't test it.

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1 Posts

12-30-2019

FI

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Re: Yoga C940 4k - Fan runs constantly

2020-02-01, 12:39 PM

Hey everyone, I found that "Game mode" was switched on in my windows settings and setting it off has stopped the fans from spinning all the time. Now I can enjoy basic web browsing and other tasks without hearing the fan at all.

 

 

I read that there is a bios update but haven't done that yet. So can anyone who has updated their bios let us know what the update does in terms of performance as that is what I care about the most.

 

I also wanted to mention that I know that this thread has gotten quite big and the loud fan issue is a bit annoying but I just want to tell everyone thats considering to buy this laptop that this is laptop has been really really good for me. It is everything I wanted and more. The build quality is amazing, the performance is amazing when it comes to what I do (Programming) and the display and speakers for media consumption is also really really good. The battery life when doing non-intensive tasks is easily 7-8 hours too. So I would recommend the laptop to anyone.

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0 Posts

02-04-2020

US

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Re: Yoga C940 4k - Fan runs constantly

2020-02-04, 6:35 AM
Is there a BIOS update on the 2019 c940 LT?
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16 Posts

12-24-2018

US

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Re: Yoga C940 4k - Fan runs constantly

2020-02-04, 16:36 PM

i tried a lot of things, including repasting the cpu, which worked great to lower temps (i can get consistent turbo speeds with throttlestop at 30w), but the high pitch noise is still there no matter how many tape positions i tried.

 

Does anyone know if there is any app to control fan speed manually somewhere out there?

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19 Posts

10-15-2019

FI

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Re: Yoga C940 4k - Fan runs constantly

2020-02-12, 12:39 PM

I can also confirm that the BIOS update helped to quiet the fans. I had silent periods even before the BIOS update but they were pretty random. Now the laptop is more consistently silent after the update, idle temperatures being between 38-44 degrees. Windows update (or some other strain to the CPU) still makes the fans kick in, but the laptop stays completely silent with light activity like browsing, writing etc. I have no regrets of buying this laptop anymore.

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8 Posts

12-19-2019

US

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Re:Yoga C940 4k - Fan runs constantly

2020-02-25, 17:35 PM

I just wanted to follow up since I posted a few times in this thread.

 

I purchased another C940 after hearing about the new BIOS update. Before doing the update, I had the same fan issues, nonstop running. I can confirm that the BIOS and intel management driver updates seems to have more or less fixed the fans running nonstop. Even when plugged in now, they are usually off, unless you're doing something obvious that causes the cpu/gpu to heat up. So I'd call the problem fixed.

 

Someone else mentioned battery life being better afterward, and I'd agree with this as well. It's still not "awesome", but I'm getting right around 5 hours with moderate use on my i7/4k model. With lighter use, say just web browsing, and lower screen brightness you could probably get closer to 6 hours or so, maybe more.

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3 Posts

03-06-2020

MX

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Re:Yoga C940 4k - Fan runs constantly

2020-03-06, 22:16 PM

someone could reduce fan noise?

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6 Posts

12-21-2016

US

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Re:Yoga C940 4k - Fan runs constantly

2020-03-12, 1:46 AM

I have been use this laptop C940 4k and I just noticed fan makes notice even I just browsing  not watch a videos? the laptop is significant, there are  No Doubt have good quality, good speed good material, and  screen so clear, but again the only problem is  the fan it makes noise most the time

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135 Posts

12-08-2019

US

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Re:Yoga C940 4k - Fan runs constantly

2020-03-12, 14:06 PM
Did you try undervolting already? Best way currently to reduce this, apart from pressing Fn + Q till a battery icon appears marking it's in energy save mode. Guide for undervolting: https://www.maketecheasier.com/reduce-cpu-temperature-undervolting/
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10 Posts

02-10-2013

Germany

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Re:Yoga C940 4k - Fan runs constantly

2020-04-28, 21:42 PM

Hi,

 

I will return my c940 i7 UHD 16GB RAM 1TB because plugged in the right fan runs almost always and is too loud. I clearly hear the whining/high pitched noise (by air beeing sucked in through the grill). Covering the holes a bit with my hand/tape helps, but that is not a solution for a 1800€ machine.

 

Does anybody know if the i5 version runs way cooler? Or is the problem with the fan design immanent?

 

 

Anybody c940 with i5? 

 

 

Unfortunatly the i5 only comes with 8GB RAM, so i might need to go with the c740 instead :-(

 

Is Lenovo aware of the problem and are they going to do anything about it? The rest of the machine is really great; i love it. 

battery on UHD is 5-7h, which is a bit low

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