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25 Posts

08-17-2018

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

2018-08-18, 9:35 AM

This is due to the fact that Lenovo has set a very low level of temperature - under Windows almost no chance for turbo - bios 1.06! Under Linux and my kernels yes, but it's not for much because above 50-55 deg. C blocks on clock 1.8 and end ... TURBO OFF !!!! This is Lenovo's policy - they should give a choice [in BIOS] or normal performance and loud fans ... or very poor performance and silence [Although you can make a lot of it out on Linux] - under Linux = Kubuntu and our solutions> www.netext73.pl in normal operation fans do not work at all. It is a scandal that the bios descriptions have no information from such processors as 8 generations i5 and i7 they turn off the turbo - for what we pay?!?!

 

https://www.youtube.com/watch?v=L3RrYxFzoIY&t=8s

 

https://www.youtube.com/watch?v=2rtnMAfGm4k

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2 Posts

07-26-2018

United States of America

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

2018-08-18, 11:21 AM

I think some people are making this a bigger deal than it is. I've had mine for a couple months. The rediculously simple changes in settings many others have posted as well as me has worked just fine. There's no noticeable difference in performance. I use Premiere Pro and other app hogging applications all the time and my machine performs flawlessly. I couln't be happier with this laptop. This horse has been beaten to death. 'Nuff said... 

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42 Posts

01-25-2018

United States of America

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

2018-08-18, 11:42 AM

Glad to see more people jumping on the issue.  My best workaround was to create a custom power plan with processor state to 98% on battery and 100% on AC.  No

matter what you’re told, you don’t need that clock speed for browsing, productivity, or

video.  Chrome also uses hardware accel which dips into the GPU a bit.  What you do need it for is gaming, intensive art/design programs, programming/stats software—etc...but you’ll rarely be doing that stuff on battery as it’ll drain it right away.  Furthermore, settings state to 98% will give you a significant battery boost.  To those saying they notice a slower speed when browsing, that’s not a thing. Your cpu doesn’t need to boost (just look at your usage stats when running chrome).  Lenovo is definitely at fault for the terrible fan cycling and sublet bios settings though.  They had more than enough thermal headroom.

 

I also undervolted and repasted  the CPU and now it’s pretty good for a thin and light laptop.  That brings me to my next point:  this was my first thin and light laptop with a quad core CPU.  They run hot!  I picked up a 15 inch HP Spectre and returned it because the fans were loud (though the cycling was better) and it was throttling under normal use—the i7 8th gen U was regularly hitting 90-100C if, say, my virus software decided to run a scan.  If you’re going thin and have a dedicated GPU with a quad core cpu, you’re gonna get heat and throttling or loud fans. Just ask the Dell XPS.  I tried the Samsung Notebook 9 pro (i7 8th gen) and got nowhere near the noise level of the Lenovo, but more throttling was happening.

 

the 720s’s fan noise is pretty avg for a laptop in its class though it’s not done any favors by that high pitched whine noise (that probably comes from the fan bearings).  Undervolting and repasting can net you at least 10 degrees less and reduce how often the fan will rev up., but don’t do it unless you’re relatively tech savvy and confident enough.  If you want to “unlock” the processors and force boost as often as possible, use “Throttlestop”.  I got the i5 model and could

maintain boost on all 4 cores.  Unfortunately, the MX150 is locked, power throttles, and I couldn’t find a way to unlock the voltage.  It’s a low power GPU, though it’d be nice if they’d add a little juice to

maintain that boost speed longer.

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25 Posts

08-17-2018

Poland

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

2018-08-18, 11:42 AM

what changes are you talking about ???

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20 Posts

07-10-2018

Poland

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

2018-08-18, 11:44 AM

https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Lenovo-720s-14ikb-81BD-new-v-bios-update-error-6LCN22WW-V1-08/td-p/4177905

 

I create a new topic about that bios update error. And also I send message to lenovo support with full update video.

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42 Posts

01-25-2018

United States of America

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

2018-08-18, 20:00 PM

What do you mean?

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25 Posts

08-17-2018

Poland

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

2018-08-20, 7:18 AM

I asked what you changed, so that the turbo boost would always work ... and turn off the thermal throttling ... which starts at 55 degrees Celsius, usually from 85/90 degrees Celsius ... which is subtly "funny" ... obviously this should make the standard 'out of the box' ...

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42 Posts

01-25-2018

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

2018-08-21, 2:40 AM

I used Throttlestop  (free software--it has a preset, either "game" or "performance" that will force turbo).    In Intel XTU (also free), I undervolted the CPU (don't remember the exact number for the machine, but it you look up the processor online you can find a stable undervolt).  Iwas climbing up into the high 80's--might've hit 90 at one point, but was getting a sustained boost and that's still lower than the Dell XPS and HP Spectre temps (which will literally hit 100 before throttling down).  This was all while using a "high perfromance" power plan preset in W10 settings, though Throttlestop should override the power plan...in theory.   Keep in mind, I did repaste, but undervolting is usually effective enough on its own. 

That said, the GPU would always throttle and the system wouldn't let me undervolt it with an overclocking utility.  Temps were great (never cleared 71 C, but the MX150 would power throttle when I turned it on high performance (nvidia settings) and tried to maintain the boost clock.  This is to be expected as it's a low-power GPU and the system is running on a 65W power brick.  I looked around and other people were having trouble unlokcing the MX150, so it was probably manufacturer-locked.

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25 Posts

08-17-2018

Poland

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

2018-08-21, 7:18 AM

Under Linux, it does not suppress the GPU - if you manage it properly - my Bumblebbe build and optimized Nvidia drivers, optimized kernel, etc - our NeteXt'73 project [www.netext73.pl] - reaches [and holds] 1885-1911 MHz. Temp max to 89 deg C ... only with CPU I have a problem. I hope that this will improve in the next BIOS revision, because 1.06 is a total failure.

 

https://www.youtube.com/watch?v=L3RrYxFzoIY

 

https://youtu.be/2rtnMAfGm4k

 

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25 Posts

08-17-2018

Poland

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  • Posts: 25
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Re: Ideapad 720S-14IKB fan noise/cycling

2018-08-21, 8:19 AM

Of course, you can also include turbo under the BIOS 1.06 but it's a bit of a problem ...

 

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