Lenovo C940 - Troublesome in Modern Standby Mode


  1. Posts : 42
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       #1

    Lenovo C940 - Troublesome in Modern Standby Mode


    Hi all.

    Ongoing troublesome Lenovo C940 here.

    Latest primary symptoms: In modern standby mode, various background processes are incredibly active. This means, maybe 30%-50% of the time, I come back to a very warm laptop, or a hot, dead battery if it decides to do this while unplugged/in a bag.

    Investigations: My main investigative work into this problem has been SleepStudy reports. When I do come back to the computer and it's warm, I produce a sleep study report to investigate. No two occasions show the same cause of the high activity though. I've attached a few recent sleepstudy reports for someone to review and help troubleshoot. You'll note the red colour-coded Modern Standby states.

    Lenovo C940 - Troublesome in Modern Standby Mode-annotation-2020-02-01-175629.pngLenovo C940 - Troublesome in Modern Standby Mode-annotation-2020-01-29-220329.png

    I've already had the motherboard replaced for other waking-from-sleep problems (maybe related, maybe not); that didn't change anything.
    I repair-installed the OS, which changed the problem to primarily be high activity in Modern Standby mode, resulting in frequently recurring BSOD problems -- especially BSOD while in Modern Standby mode.
    Then I reinstalled the OS twice (reformatting both times), once using the Microsoft-sourced Windows 10 1909, and then subsequently using the Windows 10 sourced from Lenovo specifically meant for the C940. Both reinstalls resulted in the same high-activity during Modern Standby, as well as causing the fingerprint reader and webcam to stop being usable; the fingerprint and webcam just suddenly started working today though, with absolutely no change to anything, as far as I can tell...

    Therefore, just reiterating, the PRIMARY remaining problem is this high activity in modern standby. Lenovo have told me that I'm not supposed to leave a laptop in this mode unattended, and that high activity in this mode is normal; even that draining 79% of the battery in Modern Standby mode for 25 hours is fine...

    Windows Version: 10.0.18363 and just installing KB4532695 in the background.

    - - - Updated - - -

    Please, if there is anything else I can do to get some support, let me know Do you need other logs, or anything else?

    - - - Updated - - -

    Another instance, with another example of a different source of the power drain in Modern Sleep mode.

    Can anyone help? What else do I need to share?

    Lenovo C940 - Troublesome in Modern Standby Mode-annotation-2020-02-03-195523.pngLenovo C940 - Troublesome in Modern Standby Mode-annotation-2020-02-03-195440.png
    Lenovo C940 - Troublesome in Modern Standby Mode Attached Files
      My Computer


 

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