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7 Posts

10-17-2020

Turkey

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Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-17, 14:13 PM

 

I'm C940 owner for 2 months (i7, UHD, 16GB RAM, 512GB SSD). I don't remember exactly when it was started but maybe bios update cause this. But i experienced display issues for weeks. 

 

As seen on pics screen occasionally going crazy. Especially bottom 1/10 display area cloned and going around up-down for a while. Sometimes it becomes normal by itself, sometimes screen goes black until touch to screen, then it comes back to normal..

 

But, when device connects to external display everything is ok, nothing happened unusual related with display, 

 

Flickering especially happen on battery power. But it"s happen with power adapter either. But very rare. 

 

I'm wondering is anyone in here who's own c940 and not experienced this. Because this is very common issue. Maybe all of C940 has this display problem. 

 

I'm also wondering how Lenovo not able to fix this widespread and important issue.

 

My workaround about issue;

 

  • - Reset (Win 10 reset, not via factory reset key)
  • - Try several display drivers from Intel and lenovo
  • - Try Intel chipset drivers instead of default
  • - Try Lenovo recommendations about screen issues like this from official web page

 

I'm also search internet and found a possible solution with uninstall Win 10 2004 update and back to 1909.. Some reddit users report that is a possible fix, but i don't accept this solution, because i don't want to stay last year op system release because of someone's unresponsibility..

 

LENOVO, PLEASE FIX IT ASAP...

 

Please respond C940 owners which is affected with this problem. Please share your experiences here..

 

 

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48 Posts

10-03-2020

Norway

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-17, 17:20 PM

see my reply at:

 

https://forums.lenovo.com/topic/findpost/1071/5019631/5153898

 

or on reddit:

 

https://www.reddit.com/r/Lenovo/comments/irj6zo/is_anyone_else_having_this_issue_on_their/

 

its an win10 may 2004 update issue related to hardware acceleration.

windows 10 1909 works fine, no issues.

 

No reply yet from lenovo or microsoft regarding this issue. Lenovo should pull c940 from the list of testet an "working" on may 2004 update thread.

But as stated its not the 2004 update itself but an KB released later.

 

latest gfx drivers and even betas have not fixed this

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7 Posts

10-17-2020

Turkey

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-17, 20:28 PM

Thanks a lot Bertil78.

 

I will report it to Microsoft too, but it seems issue persist on october release. 

 

If too many bug report received by Microsoft about this problem, maybe they'll sort it out in final release..

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10 Posts

10-07-2020

Pakistan

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  • Message 4 of 248

Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-18, 7:51 AM
well i reset my laptop with factory reset key and after everything was set. the same screen thing occurred again. you can imagine my disappointment. what else doesn't change with a factory reset? the answer seems to be bios. but i m not expert and experts seems to be not caring. its an embarrassment
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48 Posts

10-03-2020

Norway

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  • Message 5 of 248

Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-18, 12:41 PM
windows 10 1803 , 1809, 1909 or 2004 ? Latest drivers and bios?
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3212 Posts

12-13-2016

United States of America

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  • Message 6 of 248

Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-18, 14:35 PM

@ aamjad2001 wrote:
 

well i reset my laptop with factory reset key and after everything was set. the same screen thing occurred again. you can imagine my disappointment. what else doesn't change with a factory reset? the answer seems to be bios. but i m not expert and experts seems to be not caring. its an embarrassment

 

Boot into BIOS screens.. no OS. See if it happens there. 

 

To @Bertil78's point, a lot of people are just skipping 2004, even if the device they use is tested to work with it. 


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2 Posts

10-21-2020

United Kingdom of Great Britain and Northern Ireland

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  • Message 7 of 248

Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-21, 10:29 AM

Same issue here...

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1 Posts

10-21-2020

United States of America

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  • Message 8 of 248

Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-21, 16:15 PM
Same issue.
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7 Posts

10-17-2020

Turkey

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  • Message 9 of 248

Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-22, 9:10 AM

Hot News !!!

 

Lenovo release BIOS update for C940 today..

 

AUCN57WW

 

https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/yoga-series/yoga-c940-14iil/downloads/driver-list/component?name=BIOS%2FUEFI

 

There is no info about display issues on release notes.. But i wish problem solved by Lenovo silently.

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7 Posts

10-17-2020

Turkey

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  • Message 10 of 248

Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-10-22, 10:20 AM

Update...

 

Sorry.. Not worked : (

 

Same things happen again on battery power : (

 

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