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1 Posts

12-05-2020

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-05, 5:05 AM

Hi just wanted to add on with my experience. I purchased my Yoga c940 in July of this year. Started having this flickering on the bottom of my screen. Most often in the morning when attending Zoom lectures. It would go crazy. Contacted lenovo and they had me send my laptop at the start of September. They replaced and repaired multiple things (LCD, mainboard EDP cable, cable, camera, bottom covers) Not sure why they replaced all of this or what some of those parts have to do with the issue, but I went a long. I got the laptop back exactly 1 month later only to have the same issue occur two weeks later. Now two months since the repair occured it has happened to me only 3 times. Ussually Ctrl Alt Dlt stops the issue. It's so frustrating though seeing so many have the same issue and the company not taking action. Hopefully they do something about this. 

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14 Posts

12-05-2020

Czech Republic

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-05, 6:39 AM

Hello, its not good news, I hoped that changing the mainboard and display resolved this issue.

I have my C940 from September 2020, screen flickering appeared immediately after update W10 to update 2004. I had contacted Lenovo service - they changed only the display - but the problem appeared repeteadly shortly after returning from Lenovo service. I taked back Win 10 to update 1909 as adviced at forums (Reddit, Lenovo...) - and C940 is fully functional without any screen flickering after this downgrade. Hardware acceleration I have on. I think that stay at W10 update 1909 is only the best way to have a fully functional C940 at this time...but in May 2021 will ends the support of W10 update 1909...Lenovo wake up !

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5 Posts

12-06-2020

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-06, 23:54 PM

I purchased my C940 January 2020 (Build date 10/2019). It came with Win 10 1903. I upgraded to 1909 and then 2004. I have had the screen flicker with all versions. More so with 2004. I did notice, if I touch the touch screen as soon as it starts flickering, it will stop. Usually the flicker starts at the same time I make a mouse movement. My warranty is getting ready to expire. I will more than likely extend it, until there is a resolution.

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49 Posts

10-03-2020

Norway

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-07, 11:46 AM

hi

 

if you have the flickering with all versions it sounds more like an hardware issue. Moving mouse and the touchscreen thingy.

my suggestion is to upgrade the gfx drivers with the latest intel official ones from their site.

And use the Lenovo vantage or Lenovo system update tool.

 

try going back to 1909 and see if its still there.

 

As for myself an others 1903 and 1909 works great, but on 2004/2009 everything goes to hell once more.

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2 Posts

12-07-2020

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-07, 16:54 PM

Hey guys!

So I was having the same glitch with the multiple taskbars and I think I found a fix.` Intel has a beta Iris Plus Graphics driver that you can download from their website. the latest beta should fix all of the issues and give you a small boost in battery life (as I did). I was as frustrated as you guys and I will update this post as time passes. Best of luck to the c940 owners in this thread!

 

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62 Posts

11-14-2020

Turkey

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-07, 17:06 PM
Hello You just fired up a hope sparkle :) Well, can you put the link of the driver u mentioned in your post. That will be very useful for people to be sure that they an download the same driver as you did.
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135 Posts

04-26-2020

United Kingdom of Great Britain and Northern Ireland

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-07, 18:26 PM

Download link is below. It's installed fine on my C940. Hopefully it fixes the issues.

 

https://downloadcenter.intel.com/download/30027/Intel-Graphics-BETA-Windows-10-DCH-Drivers?product=98911

 

Driver version 27.20.100.9025

 

Thanks Lenovo for letting your customers figure things out for themselves you bunch of useless *****

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62 Posts

11-14-2020

Turkey

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-07, 18:57 PM

Ok, Thanks for the link so lets try it all. I will update about my situation.

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5 Posts

12-06-2020

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-08, 1:24 AM

I tried the new beta driver, and it did not help. My screen started flickering within an hour of installation. 

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18 Posts

10-04-2020

United Kingdom of Great Britain and Northern Ireland

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-08, 15:55 PM

@Sid33 , I think you've got a problem above and beyond what the rest of us have, especially if you had issues when on Windows build 1909.

For the other people who've posted cautiously optimistic comments about newer Intel drivers, @kradcliffe and @A-C940-User - how are things holding after a day or two?

Meanwhile, there is one chap on Reddit who has confirmed stability on this driver:

https://downloadcenter.intel.com/download/29988/Intel-Graphics-Windows-10-DCH-Drivers?product=80939

and the beta driver is at this address (a few links to this in this thread seemed to be broken)

https://downloadcenter.intel.com/download/30027/Intel-Graphics-BETA-Windows-10-DCH-Drivers?product=80939 

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