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49 Posts

10-03-2020

Norway

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-02-12, 9:14 AM

i noticed when doing windows updates to later revisions such as 789, 804 etc, the flickering might start again.

solution is to do a installation of the intel driver again. all good.

 

sometimes after intall the installer starts again after reboot. just hit cancel.

 

as stated, lenovos drivers are from the stoneage. use the ones from intel site:

 

The latest at the moment is 27.20.100.9168 (intel site)

Download Intel® Graphics - Windows® 10 DCH Drivers

 

https://downloadmirror.intel.com/30148/a08/igfx_win10_100.9168.exe

 

this is the latest official one, but i think there is an 9263 coming soon (its available on other sites)

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1 Posts

02-12-2021

Romania

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-02-12, 10:38 AM

can anyone confirm if this is the issue? I'm having this on a Yoga 9i 4k i7-1185g7

 

watch?v=-pnEbWqhU7g (Don't know if URLs are allowed so just go on YT and watch that link.)

 

For anyone who doesn't dare. The screen glitches, shows random artifacts and flickers on and off only after wake from sleep.

What I was able to figure out so far is that:

- windows version doesn't matter. I tested 1909, 2004 and 20h2.

- intel graphics driver version doesn't matter. I tested everything I could download from the intel website.

- I have another Yoga 7i with an i5-1135g7 and used the driver from that one just for giggles. Same issue.

- I tried disabling S0 sleep state and using S3. It won't wake up from S3 so that's a no go.

- Temperature of the laptop seems to matter.

 

The only time it doesn't do it is when it's warm to the touch. If the bottom plate is cold to the touch and I wake it from sleep it glitches like crazy .. unusable crazy. Once it warms up glitches and flickers go away. I can even put it back to sleep and wake it again and it won't do it. Once it's stone cold and I wake it from sleep it starts doing it again.

It doesn't do it if I reboot it regardless if it's cold or warm. That is maybe also why it doesn't do it in BIOS.

 

I'm still not sure if it's a hardware or software issue. The temperature thing may be in my mind only.

 

Short comparison to the Yoga 7i: I got the 7i first for myself coming from a y740 (rtx 2070, i7-9750h) on which I never really gamed so I got rid of it and started looking at something more "practical". I looked at all kinds of battery and CPU benchmarks because I mostly do coding and want it to last a lot of time. Lenovo seems to have kind of the best battery life out there (for the money that is) on the Tiger lake. My wife started eyeing my 7i so I figured why not give it to her and get the 9i for myself. 4k, i7 ... awesome right? Nope :) the i7-1185g7 benchmarks ~5400 points in r23 while the i5-1135g7 benchmarks ~5900. Temperatures are higher on the 9i and the fans just never stop. The 7i is dead silent. The battery is smaller on the 9i and it shows when you actually use it. So the only thing better is the screen .. which glitches. I think you should just get the 7i. It may be the best value for the money. Better performance overall, better battery, more silent. What was I thinking?

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49 Posts

10-03-2020

Norway

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-02-12, 14:10 PM
@amne If the drivers dont solve it, its an hardware issue. Check if the same thing happens in the bios The last 3 drivers from the intel site more or less fixed it for most of us.
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1 Posts

02-21-2021

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-02-21, 3:33 AM

Hi All,

I need some advice. I tried to follow the forum but I'm getting confused.

 

My specs are:

Model: Intel Yoga C940 (14")

Operating System: Windows 10

Driver: Intel (R) Iris (R) Plus Graphics

 

Full story:

My computer died randomly. I was working and bluescreened me. I went tried everything to get it back up and running. I followed every help tutorial for the bluescreen but nothing worked and it wiped all of my data. I brought it to best buy where we bought it and they said that this happens because we missed a Windows update or two and then because of type of hard drive it wiped everything when this bluescreen happened? I don't know I didn't really follow. So they did a clean Windows update and now we have this screen flickering issue. 

 

But if I'm following correctly we have the best graphics driver we can have? 

 

Any suggestions on anything to try? 

 

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49 Posts

10-03-2020

Norway

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-02-21, 19:14 PM

dont use the driver from lenovo site.

 

get it from intel

 

Download Intel® Graphics - Windows® 10 DCH Drivers

 

or the latest beta

 

Download Intel® Graphics - BETA Windows® 10 DCH Drivers

 

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14 Posts

12-05-2020

Czech Republic

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-02-23, 16:06 PM
Just information from the former owner of the Lenovo C940. After 3 complaints and finally returning the laptop to the seller, I bought a Lenovo 9i - it differs by improved cooling (according to information on the web in cooperation with Intel). I have had a new 9i for about 2 months - without a single error in the graphics display pages - in addition, the notebook has significantly lower temperatures in the same operation as the original C940. From this I conclude that in the case of the C940 it is a bad cooling solution - which leads to the disintegration of the display and, unfortunately, over time, the components on the motherboard will be damaged with a subsequent malfunction, as was the case with me. I also observed it on my C940, at a time when the problems worsened. As part of my warranty, both my motherboard and display were replaced, but at which time the symptoms continued. The wrong cooling solution is a possible cause of problems with the C940.
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3 Posts

03-18-2019

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-02-26, 1:15 AM

https://downloadcenter.intel.com/download/30248/Intel-Graphics-BETA-Windows-10-DCH-Drivers

Intel® Graphics - BETA Windows® 10 DCH Drivers

Version: 27.20.100.9313 (Latest) Date: 2/17/2021

 

Latest BETA Driver works fine, HDR Option also working now. Not sure if it resolve Screen Flickering issue. 

 

 

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1 Posts

03-07-2021

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-03-07, 10:47 AM

Setting the refresh rate to 48.000 Hz instead of 60.000 Hz solved the problem although it should not be that way.

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2 Posts

12-14-2020

Oman

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-03-11, 13:07 PM

My laptop also have same issue. While making contact, never ever the automatic questions coming related my issue and found it is time wasting. How can I sole ? Lot of customers asking and LENOVO keep silent why ?

 

PADMAKUMAR A.G., MUSCAT,

 

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3 Posts

03-18-2019

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2021-03-11, 20:05 PM

Download and install latest Intel Graphics Driver.

 

https://downloadcenter.intel.com/download/30266/Intel-Graphics-Windows-10-DCH-Drivers?v=t

 

it works fine, no issue after install this upgraded driver.

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