Monitor keeps waking up every few minutes due to "Kernel-Power" event with "Reason Unknown"

ahoyjos · May 24, 2025

My hardware:
ASRock x870e Nova WiFi
9950x3D
ASUS TUF 4090 OC
G.SKILL Trident Z 2x48GB

My monitors are set to turn off after one minute idling, but they keep waking up every few minutes due to the following event in Event Viewer (X is current state #)

The system session has transitioned from X to X+2.
Reason Unknown
BootId: 51

This is causing my OLED panels to never enter OLED Care / Pixel Cleaning mode due to never being shut off for 15+ minutes.

I have tried the following all to no avail: safe mode, disabling wake timers, disabling WAN/Bluetooth, removing my WAN/Bluetooth radio, unplugging all USB devices, removing wake permissions from Bluetooth/WiFi/mouse devices in Device Manager, updating my drivers, updating Windows, turning off monitors through Task Scheduler instead of Power Plan, unplugging either monitor, switching either monitor from DP to HDMI.

Could anyone advise how to diagnose which device or driver is causing this, or how to configure Windows to never wake my monitors except for keyboard input? Full XML of the latest event:

XML:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331c3b3a-2005-44c2-ac5e-77220c37d6b4}" />
  <EventID>566</EventID>
  <Version>0</Version>
  <Level>4</Level>
  <Task>268</Task>
  <Opcode>0</Opcode>
  <Keywords>0x8000000000000604</Keywords>
  <TimeCreated SystemTime="2025-05-24T05:08:56.9038947Z" />
  <EventRecordID>52686</EventRecordID>
  <Correlation />
  <Execution ProcessID="4" ThreadID="628" />
  <Channel>System</Channel>
  <Computer>DESKTOP-NAME</Computer>
  <Security UserID="S-1-5-18" />
  </System>
- <EventData>
  <Data Name="BootId">51</Data>
  <Data Name="Reason">1</Data>
  <Data Name="PreviousSessionId">1</Data>
  <Data Name="PreviousSessionType">1</Data>
  <Data Name="PreviousSessionDurationInUs">378329571</Data>
  <Data Name="PreviousEnergyCapacityAtStart">0</Data>
  <Data Name="PreviousFullEnergyCapacityAtStart">0</Data>
  <Data Name="PreviousEnergyCapacityAtEnd">0</Data>
  <Data Name="PreviousFullEnergyCapacityAtEnd">0</Data>
  <Data Name="NextSessionId">3</Data>
  <Data Name="NextSessionType">0</Data>
  <Data Name="PowerStateAc">true</Data>
  <Data Name="MonitorReason">1</Data>
  </EventData>
  </Event>

XxXxX · May 24, 2025

have you checked the reliability monitor for any errors
control panel > security & maintenance > maintenance > reliability monitor

also, just to check, is wake on LAN enabled in the BIOS
if it is, please set it to disabled and then keep an eye on the system.

reading your list you seem to have done most checks already.
best of luck, Steve ..

user1010 · May 24, 2025

It doesn't wake of windows notifications? Had similar problem and what I mentioned caused it.

ahoyjos · May 24, 2025

Reliability Monitor shows nothing outside of successful Windows Update checks.

Disabling "PCIe Devices Power On" in the BIOS does seem to resolve the issue, going by a 20 minute test. Ideally I'd like to keep ethernet wake-on-LAN support if possible though.

I ran `powercfg /sleepstudy` and the output shows the following information. This seems to indicate that the Power Button signal is being sent for some reason, how would I triage or disable this behavior without losing WoL? This 10-year-old forum post seems to suggest it might be the Realtek drivers misreporting a power signal.

user1010 said:
It doesn't wake of windows notifications? Had similar problem and what I mentioned caused it.

I don't see any Windows notifications on wake-up.

XxXxX · May 24, 2025

unless you set the system to just turn the screen off which you can do manually via the power switch.
that leaves the system running so wake on LAN would be unable to wake he system as its already running.

others here may have a better solution.
best of luck, Steve ..

maur0 · May 24, 2025

kanenas · May 24, 2025

For a different reason I got used to remembering a setting. It sounds as if it could mix up your settings.

Device Manager -> System Devices -> Intel(R) Management Engine Interface #1
Properties -> Power Management
Uncheck "Allow the computer to turn off this device to save power".

It usually gets reset after a driver update so keep an eye on it.

ahoyjos · May 24, 2025

maur0 said:
[GIF]

Re-enabling WoL for the ethernet adapter causes the issue to reappear.

kanenas said:
Device Manager -> System Devices -> Intel(R) Management Engine Interface #1
Properties -> Power Management
Uncheck "Allow the computer to turn off this device to save power".

Do you know what the equivalent for AMD might be? I've already unchecked that setting for the Bluetooth/WiFi devices. List of system devices:

XxXxX · May 24, 2025

have a look in device manager > network adaptors
there maybe more then one entry there

right click each entry and then properties > power management
see if 'allow this device to wake computer' is disabled.

best of luck, Steve ..

kanenas · May 24, 2025

Sorry but no ideas about AMD. I never had an AMD-based system.

A quick googling for the AMD equivalent of the Intel Management Engine Interface came up with some results but most over my head.
It seems the AMD equivalent is hidden in the hardware. It's known as PSP (Platform Security Processor). According to a comment, it shows its stuff through some device driver but they never mentioned this driver's name.

Interesting reading but not for people like me whose idea of a screwdriver is a drink.

Here's some links that came up first in the search:

AMD Platform Security Processor - Wikipedia

AMD's Secure Processor Firmware Is Now Explorable Thanks to New Tool

https://www.reddit.com/r/Amd/comments/f96l7m/intel_management_engine_on_amd

(it points to the next link and also has a reference to AMD DASH (presumably a better match to the Intel device for laptop machines).

https://www.reddit.com/r/Amd/comments/bib36s/amd_psp

That's it. Best of luck.

ahoyjos · May 24, 2025

XxXxX said:
have a look in device manager > network adaptors
there maybe more then one entry there

right click each entry and then properties > power management
see if 'allow this device to wake computer' is disabled.

Just the 5GbE controller has that option and it's disabled.

ahoyjos said:
Disabling "PCIe Devices Power On" in the BIOS does seem to resolve the issue, going by a 20 minute test.

It looks like this actually didn't resolve my issue, it just gets me to longer periods of time before it reoccurs.

`powercfg -devicequery wake_armed` shows no wake-enabled devices, so I'd think this signal has to be coming from a driver or task somewhere?

XxXxX · May 24, 2025

this looks like a process of elimination.
you could disable scheduled maintenance and see if that helps
which will occur when the system goes into an idle state.

Enable or Disable Automatic Maintenance in Windows 11

This tutorial will show you how to enable or disable Automatic Maintenance in Windows 10 and Windows 11. Windows automatically runs scheduled maintenance on a daily schedule when you're not using your computer by default. This includes tasks such as updates, security scanning, and system...

www.elevenforum.com

best of luck, Steve ..

ahoyjos · May 25, 2025

XxXxX said:
you could disable scheduled maintenance and see if that helps

No luck.

XxXxX · May 25, 2025

open advanced power settings.
control panel > power options > change plan settings > advanced power settings

go through each item in that menu and check its settings to check that nothing is set to sleep
or is set to wake up the system.

best of luck, Steve ..

ahoyjos · May 25, 2025

All sleep/hibernate options are disabled, devices are set to not wake, power off or use power-saving mode.

XxXxX · May 25, 2025

then the only thing left is something must be trying to update when the system goes into idle/sleep mode.
beyond that i am out of ideas.

best of luck, Steve ..

Monitor keeps waking up every few minutes due to "Kernel-Power" event with "Reason Unknown"

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