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38 Posts

02-02-2014

Canada

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-25, 23:08 PM

PSA to everyone experiencing this issue which should be every owner of this laptop as its a Window's feature.

 

Look up disabling "Modern Standby" or S0, that's what's causing the issue and should just require a registry edit to disable S0 and enable S3.

 

Open command prompt in admin mode and enter reg add HKLM\System\CurrentControlSet\Control\Power /v PlatformAoAcOverride /t REG_DWORD /d 0

Remove this entry in regedit to regain modern standby (although not sure why you'd want to cook your laptop TBH. 

 

This issue is affecting most Dell's, Lenovos, and I believe Acers or Asus laptops, spread this as its clear the manufacturers are not interested in fixing this. 

 

Mods, please sticky this as this could save people's laptops from possible damage.

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62 Posts

11-14-2020

Turkey

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-26, 11:15 AM

Hello,

Thanks for your share but i believe that the issue you are giving solution advice about the overheating issue on sleep mode with c940s.

Topic is most about screen glitches and flashings so it can be confusing or misleading for some visitors to try to handle screen problems.

 

I think it would be better to add this to the original post that your PSA is about overheating issue on sleep modes.

 

Regards

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4 Posts

12-19-2020

Canada

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-26, 20:38 PM

For what it's worth, I've been on the "beta Intel DCH" graphics driver version 9077 (BETA) for about 1 week now, and during that week I have not witnessed any screen flickering/glitching.

 

Previously I had 9030 FINAL and 8935 FINAL and experienced the screen glitch on both of them.

 

My Windows 10 is 20H2

 

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12 Posts

12-25-2020

Netherlands

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-27, 0:44 AM

That driver sounds hopeful! 

 

I've got the C940 15 inch with Nvidia graphics myself, so for me that wouldn't be a fix I guess. 

 

Maybe I'll be trying some other drivers aswell, but seeing I've got the issue on windows 1909, it could be a whole other problem. 

 

I'm doubting if I should just send it back and trade it for the Asus zenbook flip 15. The one the store has, has a lesser gpu though... That kinda sucks. 

 

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1 Posts

12-27-2020

Taiwan,China

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-27, 2:15 AM

 

I have updated graphics driver to latest version 9079. But widows shows error message as I enabling HDR function, then windows will restart C940.  

 

The screen model of my C940 is 14" UHD with HDR.

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170 Posts

04-26-2020

United Kingdom of Great Britain and Northern Ireland

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-27, 7:11 AM

Send them back under warranty to push for a refund folks.

 

It's the only thing that will force a fix .... or Lenovo might not even notice which is probably gonna be the outcome.

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1 Posts

12-27-2020

Iraq

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-27, 14:59 PM

I bought the cane models Yoga c940 seems like a bad choice as many people facing the same issue ., we paid a lot mony for this product and in the end I received a laptop with 2 major problems 

1. The screen has many problems as you said sometimes it gonna crazy 

2. When I put the headphones only 1 side work ..

I regretted that I invisted big amount in this laptop

 

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14 Posts

12-05-2020

Czech Republic

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-27, 17:17 PM

I have the same bug with restarting windows after switching to HDR...awesome ! (Win 10 Update 20H2, Intel driver 9079, C940 14' UHD).

 

EventData
    BugcheckCode 59
    BugcheckParameter1 0xc0000005
    BugcheckParameter2 0xfffff804c1164eef
    BugcheckParameter3 0xffff928f0fd6d770
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3 Posts

09-19-2020

United States of America

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-27, 21:08 PM

***** UPDATE *****

 

Laptop

Lenovo Yoga C940-14IIL Laptop (ideapad) - Type 81Q9 (UHD 4k Display)

CPU: 10th Generation Intel® Core™ i7-1065G7 Processor 1.30 GHz

MEM: 16 GB LPDDR4X 3733MHz

Display: 14.0" UHD (3840 x 2160) IPS, touchscreen, glossy, HDR 400, 500nits

 

Windows

Edition: Windows 10 Home

Version: 2004

Installed On: 11/5/2020

OS Build: 19041.685

Experience: Win Feature Pack 120.2212.551.0

 

Device Drivers

Display Adapter: Intel Iris Plus Graphics Driver

Version: Intel 27.20.100.9030 (12/10/2020)

 

App Version

Chrome Version 87.0.4280.88 (Official Build) (64-bit)

 

 

I haven't had any issues since 12/22 (about 5 days) now.

 

Please note the things I did appear to be just a band-aid, and not an actual "fix", but for me its sufficient for my needs.

 

The flickering screen only happened on occasion, when in Chrome. Still not able to replicate issue, other than it only happened when chrome was open...whether I was watching Youtube videos, basic browsing, or even doing nothing, just it being open but with no activity on my part, the flickering came up. but again it was not happening all the time, and seemingly random. 

 

As mentioned in previous post, Event Viewer Error (AppModel-Runtime, 65) seems to correspond to when the screen flickering happens.

 

  • Failed with 0x57 retrieving AppModel Runtime status for package Windows.

 

Going into Chrome, and disabling HWA, seemed to do the trick. Also, changing to Intel Graphics Version 27.20.100.9030, may have helped too.  Those are the 2 things I have done, and I have NOT had any issues since.

 

Chrome menu (3 dots) --> Settings --> Advanced --> System --> Use hardware acceleration when available (disable this)

 

FYI.... DO NOT INSTALL the newest Intel Graphics Driver (Intel 27.20.100.9079), which was release on 12/23/2020. This version jacked up my laptop....it wouldn't boot up afterwards. Had to start in safe mode and uninstall display adapter, and it was fine. Now, it could be something specific to me, who knows. Just sharing that I had major issue with latest 9079 intel graphics driver.  And that AppModel-Runtime error came back after installing intel 9079.

 

Intel 9030, seems to be my sweet spot right now, and that's good enough for me.

 

 

Also, never had any issues with screen or anything else while playing games on Steam (Half-Life 2, Borderlands 2, Tomb Raider, Gris) all played with no issues. laptop got warmer and fans got louder, but thats what happens, and when I stopped playing games, everything went back to normal, as expected. The only time I had issues was when in Chrome, with HWA enabled. 

 

For me, as of now, turning off HWA in chrome, is minor inconvenience, considering everything else with this laptop is working pretty darn good....so far.

 

I bought this back in Oct 2020....screen flickering was only issue, and its been gone since disabling HWA in Chrome and using intel 9030 drivers.

 

I hope this helps. 

 

Thank you.

 

 

 

 

 

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3 Posts

12-18-2020

Turkey

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Re:Lenovo Yoga C940 screen glitches, flickering, flashing

2020-12-27, 23:21 PM
Hi buddy

I installed 9030 from intel site 2 day no problem it did it again Intel released new update I installed 9079 No problem for 4 days .. it's fixed.you can tryit Good luck with

Topluluk Tarafından Doğrulandı simgesi

 

 

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