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POWERCFG -requests shows that System32\MoUsoCoreWorker.exe is the reason the computer never sleeps.

This article notes that restarting the Windows update service can fix it temporarily. It does clear MoUsoCoreWorker.exe from the POWERCFG -requests report. But hours later, MoUsoCoreWorker.exe is running again, and the computer still won't sleep.

Is there any better approach?

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  • 1
    Questions: (1) This was an issue back in June 2020. Have you updated Windows to the latest version? (2) Do you perhaps have a failed update in Windows Update history? (3) Is it possible that Windows Update is configured to update your computer at night?
    – harrymc
    Commented Dec 26, 2020 at 19:02
  • The system is a new build, installed from Windows10-2004-x64.iso. I guess Windows Update literally takes several days of work by MoUsoCoreWorker to get a new system updated. After a few weeks, is now sleeping OK with no changes on my part.
    – tim11g
    Commented Dec 31, 2020 at 18:16

5 Answers 5

Reset to default
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According to the information supplied by the poster, it's most likely that Windows was waking up the computer at night in order to install new updates, as are the default settings of Windows Update.

Once all updates have been installed, the computer goes back to sleeping happily and doesn't wake up any more. Until the next time.

Finer control over Windows Update is found in Settings > Update & Security > Windows Update and in Power Options > Change plan settings > Change advanced power settings, under Sleep, Allow wake timers.

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    That's basically the answer. Actually the computer was not "waking up at night", it was never entering sleep at all, any time of day, which got me looking at POWERCFG -requests. That went on for a few days, but eventually it settled down and is able to sleep now.
    – tim11g
    Commented Dec 31, 2020 at 22:55
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For me the Solution was:

powercfg /requestsoverride process "MoUSO Core Worker" execution
powercfg /requestsoverride process "USO Worker" execution
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I have had this same problem on my PC on Windows 10. Could NOT figure it out and did research for hours. Pulled up command prompts and only thing it said was I needed to preform an execution for mousocore worker. Even tried an override code - nothing worked.

Finally I got the bright idea to go to task manager find MoUSO Core Worker Process (MoUsoCoreWorker.exe) running under background processes and right click to end task. Working fine now and my computer went straight to sleep after. Hope this saves some time and frustation for someone.

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  • Yes, this helps, but after the restart (or PC resume), the process is back and you have to manually kill it again (so this is not a permanent and working solution).
    – CraZ
    Commented Mar 18, 2021 at 0:22
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Just run this command in an elevated command prompt:

powercfg /requestsoverride process "\Device\HarddiskVolume3\Windows\System32\MoUsoCoreWorker.exe"

Note that the part in quotes needs to match the path from powercfg -requests

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  • This didn't help me. PC is still operating awake. :-/
    – CraZ
    Commented Mar 18, 2021 at 0:21
  • I just tried it, and the evil MoUsoCoreWorker.exe no longer shows up in the powercfg /requests list. I do have an "optional" update pending; which I generally put off as long as I can.
    – Steve Smith
    Commented Mar 25, 2021 at 23:11
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The only real long term solution seems to be making a task in taskschd to kill it every N minutes. Like

schtasks /Create /SC MINUTE /MO 15 /ST 23:00 /TN MoUso_kill /TR "'c:\utils\sint\pskill' '-nobanner MoUsoCoreWorker'"

The /MO 15 is just a precaution, normally /MO 60 should do but since MoUsoCoreWorker has been known to send system into reboot, safe is safe

pskill is from Sysinternals Utilities (also live page) and share \\live.sysinternals.com\tools )

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