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05-12-2020

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Yoga C940 Won't Wake Up After Sleep

2020-05-12, 12:21 PM

I recently bought my Yoga C940, and I adjusted my processor power management to fix fan noise issue, but then afterwards, when I close my lid or my yoga is in sleep mode, it would not wake up, I have to shut it down by long pressing my power button. Keyboard lights were still on so I thought the yoga is still on, but the screen was still black. Yoga C940 is part of the Athena project that promises split second wake from sleep when opening lid and now it doesn't work anymore. Anybody having the same issue and knows how to fix this ? If anybody knows it would be a great help Thank You

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144 Posts

12-08-2019

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Yoga C940 Won't Wake Up After Sleep

2020-05-13, 4:07 AM
Going to copy paste my reply from another thread here: "Make sure Connected Standby is enabled in registry, as this was what was causing my sleep issue before. How to enable:" This requires a Registry edit. Press Windows logo + R, type "regedit.exe" and press enter. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power in registry. If you have Connected Standby enabled, this variable will have a 1 in it. If it is disabled, it will show 0. To re-enable if disabled, click the CsEnabled variable and change from 0 to a 1 in there. Reboot and you are done."

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This helped me too

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05-12-2020

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Yoga C940 Won't Wake Up After Sleep

2020-05-19, 5:46 AM
Thank you so much for the help! It totally worked, you're a savior
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3 Posts

09-02-2020

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Re:Yoga C940 Won't Wake Up After Sleep

2020-09-02, 14:25 PM

Hello thanks for your solution. I am having this problem and attempting to follow your path. But under the "Power" section I do not see the CsEnable button. I attached a screenshot of what I see. 

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09-02-2020

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Yoga C940 Won't Wake Up After Sleep

2020-09-02, 17:55 PM
Hello thanks for your solution. I am having this problem and attempting to follow your path. But under the "Power" section I do not see the CsEnable button. I attached a screenshot in this comment below.
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09-11-2020

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Re:Yoga C940 Won't Wake Up After Sleep

2020-09-11, 17:27 PM

To solve the problem of the Lenovo Yoga C940 not waking after sleep or hibernate mode despite several attempts at hard start, follow the instructions in the following links:

 

https://support.lenovo.com/us/en/solutions/ht500217/

 

Note that if hitting the Fn+F2 key when the Lenovo Logo appears does not work in your case, then scroll down the link above and follow the instructions for alternative ways. In my case, I followed the instructions specified under "To enter BIOS from Windows 10." 

 

One you have BIOS setup utility interface display, then press "Fn+F9" to load default configuration. Select "Yes" on the prompt. Press "Fn+F10" to save and exit. Select "Yes" on the prompt. Restart your computer. Note that if you have trouble restarting the computer, try pressing the start button 15-20 seconds to do a hard restart. If that does not work, then take a paper clip and perform a pinhole reset as specified in the following link:

 

https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/yoga-series/yoga-c940-14iil/solutions/ht510479-device-does-not-restart-after-bios-update

 

If the laptop doesn't restart after the pinhole reset, then try the hard reset again by pressing the start key down 15-20 seconds. I had to do all this to fix the problem. Now, my laptop screen comes on as soon as I open it. :)

 

Final note, don't update the Intel drivers that are not meant for Lenovo, which is why I resolved the issue by going through the solutions found within Lenovo.com.

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