System waking at same time every day but no lastwake info

itm · 07 Dec 2022

My Windows 10 Pro (21H2) machine wakes from sleep every day at the same time (around 20:10). If I run powercfg /lastwake it shows:

Wake History Count - 1
Wake History [0]
Wake Source Count - 0

I have disabled ALL tasks in Task Scheduler, and I can't see anything in the Event Viewer which gives a clue as to what is waking the machine.

The hardware is a ThinkCentre M720q.

Any ideas for how I can diagnose this?

Hearsepilot · 07 Dec 2022

Have you tried unplugging the ethernet cable, wakeonlan might be set.

itm · 07 Dec 2022

Hearsepilot said:

Have you tried unplugging the ethernet cable, wakeonlan might be set.

No but I have just disconnected it, and will check to see if the system wakes tomorrow evening - thanks for the suggestion.

If WOL is set I'm not sure what is triggering a network event on this machine at the same time every day.

Hearsepilot · 07 Dec 2022

Maybe your router is sending a wake packet, you'll find out by tomorrow evening if its unplugged.

itm · 07 Dec 2022

Hearsepilot said:

Maybe your router is sending a wake packet, you'll find out by tomorrow evening if its unplugged.

Any idea why a router might do that, if it hasn't been explicitly instructed to do so?

Hearsepilot · 07 Dec 2022

Virus maybe, just unplug for now to localise the issue and work from there. My router has a wake function, maybe yours has.

Try3 · 08 Dec 2022

itm said:

... I can't see anything in the Event Viewer which gives a clue as to what is waking the machine. ...

Did you look at

Log - System
Source - Power-Troubleshooter
EventID - 1

and the events immediately before it [in Custom view, Administrative events or a third-party event viewer that has a simple chronological view]?

Are there any automatically turn on at ... entries in the Bios?

Denis

itm · 08 Dec 2022

There was a Power Troubleshooter event ("the system has returned from a low power state"), but I don't see anything prior to it that would explain the waking from sleep - see image of event viewer below:

System waking at same time every day but no lastwake info-win10resume.png

The BTHUSB event detail was:
"Windows cannot store Bluetooth authentication codes (link keys) on the local adapter. Bluetooth keyboards might not work in the system BIOS during start-up."

Try3 · 08 Dec 2022

Was anything useful stated in the General & Details tabs for that Power Troubleshooter event ("the system has returned from a low power state")?

My General tabs for that event always include a 'Wake Source' entry that is more informative than the PowerCfg -LastWake data.

Denis

itm · 08 Dec 2022

Try3 said:

Was anything useful stated in the General & Details tabs for that Power Troubleshooter event ("the system has returned from a low power state")?

My General tabs for that event always include a 'Wake Source' entry.

Denis

This was the detail for the Power-Troubleshooter event:

Code:

The system has returned from a low power state.
Sleep Time: ‎2022‎-‎12‎-‎05T20:12:11.566681100Z
Wake Time: ‎2022‎-‎12‎-‎06T20:11:35.299495800Z

Wake Source: Unknown

Code:

- EventData 

  SleepTime 2022-12-05T20:12:11.5666811Z 
  WakeTime 2022-12-06T20:11:35.2994958Z 
  SleepDuration 33230 
  WakeDuration 1799 
  DriverInitDuration 316 
  BiosInitDuration 903 
  HiberWriteDuration 3993 
  HiberReadDuration 0 
  HiberPagesWritten 307245 
  Attributes 1912619025 
  TargetState 4 
  EffectiveState 5 
  WakeSourceType 0 
  WakeSourceTextLength 0 
  WakeSourceText  
  WakeTimerOwnerLength 0 
  WakeTimerContextLength 0 
  NoMultiStageResumeReason 0 
  WakeTimerOwner  
  WakeTimerContext  
  CheckpointDuration 29