PC keeps waking up - ACPI wake alarms refuse to be disabled

Question

Good morning.

Every night my Windows 10 PC wakes up, and thus wakes me up, at least once. Event Viewer shows the Wake Source as "Device - ACPI Wake Alarm". This despite my best efforts to disable ACPI wake alarms, and the fact that I can't find any active alarms.

Any tips would be greatly appreciated.

Steps taken:

• In Power Management, I have set wake timers to "Disable"
• In Security and Maintenance, I have ensured "Wake computer" is unchecked.
• In Task Scheduler, I have taken ownership of the relevant UpdateOrchestrator tasks, and unchecked "Wake computer".
• I have used Task Scheduler View to check that there are no tasks with "Wake to Run" checked.
• Running "powercfg /waketimers" shows no active waketimers.
• Running "Get-ScheduledTask | where {$_.settings.waketorun}" in Powershell shows two tasks, both in "Disabled" state.
• Running "powercfg /devicequery wake_armed" shows only the mouse and keyboard.
• I have even reinstalled Windows, just in case something weird was up with the old install.

I have referred to the following sources but after trying all the suggestions I am no closer to a solution

• https://www.reddit.com/r/windows/comments/burul7/desktop_keeps_waking_itself_from_sleep_acpi_wake/

• Conclusively stop wake timers from waking Windows 10 desktop

• How to tell what wake source is when Wake Source: Unknown
• https://www.vistax64.com/threads/power-options-and-sleep-mode-problems.63567/

Answer 1

The wake up alarm is due to the hibernating after sleep

1. Open Power Options
2. Change plan settings
3. Change advanced power settings
4. Change "Sleep" > "Hibernate after" values
5. Goto sleep state
6. Wake up
7. Run in terminal: powercfg /SLEEPSTUDY
8. Open created file C:\WINDOWS\system32\sleepstudy-report.html
9. Find latest section (near the bottom)
10. The diff time == the hibernate after time

Answer 2

On Windows-11:

0. Open and Admin CMD or Powershell.
1. To directly open the relevant power control/configuration panel:
   PowerCfg.cpl "@0,/editplan:85d583c5-cf2e-4197-80fd-3789a227a72c"
2. Or Run: powercfg.cpl to open general power control/configuration panel.
3. From there, select the following settings:
4. Select Balanced plan, and
5. Click on Change plan settings, and
6. Click on Change advanced power settings.
7. Select Balanced from the drop-down, and
8. Expand the Sleep category, and
9. Under Allow wake timers you then select/change to have:
   On Battery: "Disable"
Plugged in: "Important Wake Timers Only"
   OR use Disable also for plugged in.
10. Click "OK" and exit.