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25 Posts

08-06-2015

Germany

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Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-08, 6:37 AM

Hey

 

Trying to get a feel what everyone is getting for real world use of the Laptop. I switched to the FHD Version for more Batterylife but i still find it far from what lenovo promises.. not even half. Right now im on "more battery efficeny" on windows and 25% brightness, and windows says i have about 6h of Batttery. I would have at least expected a full day of use. 

 

I dont wont to imagine what i would have with the UHD Version

 

What are you getting? 

 

 

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8 Posts

11-02-2019

Netherlands

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Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-08, 9:04 AM

I received my i7 UHD on monday. My current system is a SurfaceBook2 13" with I7 and a 3000x2000 screen and an nvidia dGpu which I never use or need.  But they are nice systems to compare.  I mostly use my laptop on AC power with an attached 4k monitor... with an extended desktop that means a lot of screen real-estate to feed. I'm a developer, not a gamer.

 

The first thing I noticed on the c940...  noise!  Definitely the fans and possibly coil whine. Fans mean temperature thus power consumption..  I'm still experimenting with "intelligent cooling" and "cool & quiet" power modes...  i will NOT be using performance mode as i can't stand the whine..  Obviously switching modes makes a real difference. 

 

I've since learned that Intel introduced Dynamic Tuning 2.0 for IceLake processors. Lenovo engineers definitely have some learning and tweaking to do on this machines powe management. Alas the tuning software is available only for OEMs...
.

 

 

I'm using both cpuid HWMonitor and  Intel Power Gadget 3.5 to monitor clocks, power & temps on both machines.

When typing this on my SB2 I every proggie closed except Chrome,HWMonitor and PwrGadget.  thus basically idle with cpu <=5%  
SB2   on AC with 4k attached..   PackagePower: 1-4W with a temp <=40c
c940 on AC sans 4k                     PackagePower  1-30W with temps from 40 to 80C.  (Intell Cooling..) Even background apps that "push" the cpu for 2 or 3 seconds can kick the system into high gear with Fans going and temps shooting up...

That said..   with the right choice of cooling profile (Lenovo Vantage.. Intelligent Cooling OFF, Cool&Quiet ON) and Windows power slider to the lower settings I do get  more than 6 hours of continuously binging vids....  on UHD.    Be aware to turn off video processing.. that EATS power like a hungry hippo.

more to follow i think...


 

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25 Posts

08-06-2015

Germany

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Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-08, 19:36 PM

Great info !!! What is video processing? Where can i turn it off? 

I hope there will be some bios or other improvemnts to the fan issue.. 

I cant also not believe that no reviewer mentioned the fans.. it is loud and not a little bit. 

 

 

"I've since learned that Intel introduced Dynamic Tuning 2.0 for IceLake processors. Lenovo engineers definitely have some learning and tweaking to do on this machines powe management. Alas the tuning software is available only for OEMs"

 

What do you mean exactly .. is this an hardware issue or can be fixed or optizid software vice?

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8 Posts

11-02-2019

Netherlands

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  • Message 4 of 19

Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-09, 1:13 AM

Video Processing ..  search: Video Playback Settings  Uncheck "Automatically process video to enhance it".. 
note that  Intel Graphics Command Centre: Video Modes  requires this to be on...   
but if you check GPU activity in Taskmanager you'll notice the GPU will be mostly idle when it's off... for youtube or my TV provider app it hardly makes a difference in the video quality...

Dynamic Tuning 2.0 is very new. not a lot to be found on the specifics. I do notice the Turbo Clocks kicking in a bit more agressively than on my SB2...  it's  software tuning app that Lenovo engineers must use to tune the cooling/throttling of the entire package (Enclosure/CPU/Fans etc.)

I cannot stand the noise. For me it's coming from the top right corner of the base... somewhere under the 9 and 0 keys.
If I cannot solve it this weekend I'll start the return process and buy a different laptop.  No use having an i7 laptop that you can only use in powersaver mode.

Doing nothing more than a bit of Excel, Mail and Browsing my Package temp is around 50c... with 0-3% CPU... doing a tiny bit of work and it shoots up and the darn fans start whirring.   (My SB2 generally hovers around 36c and no fan needed. Doing a fairly large build process in visual studio might push it up a bit but still no fans and temps drop back below 40 as soon a the process is done.

 

I'm curious to know your (idle or low load) temperatures, please let me know!

 

 

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25 Posts

08-06-2015

Germany

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  • Message 5 of 19

Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-09, 7:56 AM

Yes i hope to get more insides on the issue, too. But i had 2 devices and both had the same issue. I can´t believe no reviewer even mentioned it.

 

 

 

 If you tell me how to measure those .. i gladly provide you with the infos.

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8 Posts

11-02-2019

Netherlands

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  • Message 6 of 19

Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-09, 9:43 AM

not hard.. goto Intel Power Gadget  or HWInfo

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25 Posts

08-06-2015

Germany

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  • Message 7 of 19

Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-09, 21:15 PM

Wow mines even worse.. have 50-70c .. cpu around 8% right now i have a dongle on it hooked to a tv ... 

 

Please keep me posted. I really dont want to return this. For me there is no option. Spectre isnt available in germany. XPS you have to wait about 2 weeks.. also distributer wont take returns because i made a bussines order. I hope this can be fixed.

 

One question though.. if i have it set on cool and quite the notebook limits the performance? So for games i should disable it, yes?

 

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8 Posts

11-02-2019

Netherlands

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  • Message 8 of 19

Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-10, 11:42 AM

for games you absolutely need performance mode (and wear nc headphones to tune out the fans)

with a lot of fiddling I've found the bare minimum battery discharge rate of 4.5W on idle and screen brightness at 0% (custom power plan)... with a capacity of 60Wh that would give 13hours of doing nothing.  brightness at 50% that goes to 7.5W (8hrs)... 
With more fiddling i get the temps below 40C on idle.. but the settings i used are denying any performance from the i7...   

so let's watch Lion King in 4K and HDR  .. discharge goes to 15W(4hrs) at 50%.. turn that up to 100% and you're looking at 21W (3 hours)..  you'll need a full charge to get to the end ;-)

so: the C940 for me is not useable. the high temps mean fans kick in, or i need to throttle it to a fairly useless state.
this laptop will go back to Lenovo.


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25 Posts

08-06-2015

Germany

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  • Posts: 25
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  • Message 9 of 19

Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-10, 13:41 PM

You don't think its bios or software fixable..? I'm confused that no reviewer mentions this problems... Maybe faulty devices? What will you go for instead?

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8 Posts

10-15-2019

Singapore

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  • Message 10 of 19

Re: Yoga C940 FHD/ UHD Real Life Battery Life

2019-11-12, 15:46 PM

20 to 30 % per hour for UHD screen just browsing on internet.

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