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On a Dell Vostro 3470 desktop running Windows-11 Pro 21H2 build 22000.795, while troubleshooting an issue related to waking up from sleep (yes S3 sleep, not Modern Standby, as this platform does not support S0) I encounter numerous events in Event Viewer > Windows Logs > System similar to this: Kernel-Power Event 566 The events in question are all Kernel-Power events with EventID 566 and descriptive text such as The system session has transitioned from xx to yy. The xx and yy differ, but yy is always one greater than xx.

As they are all Information events, I consider them non-critical. But I simply cannot find any information anywhere that can tell me what they mean. Although I have discovered this page, which enumerates and describes values from 0 through 7, the events I'm seeing routinely report values well above 7, as shown in the attached screen shot. And I've found no information anywhere regarding how to decode the associated Reason (in the above case, Reason 32.)

Can anyone provide any assistance in decoding these events, the meanings of xx and yy, and how to interpret values for Reason?

Charlie
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1 Answers1

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I am using 2 Windows 11 Pro laptops and sleep on both works well.

Update BIOS (UEFI), and Power Management driver. In fact use the Dell Updater App to do this.

Do a final restart and test.

These are the two prime hardware issues to check for and address.

You should also test the hardware with the Dell Hardware Diagnostic App to see if there are hardware issues.

Did your machine come with Windows 11 Pre-load or was it upgraded from Windows 10?

You may need to try a Windows 11 Repair Install if nothing else fixes the issue.

https://www.microsoft.com/en-us/software-download/windows11

If everything is truly up to date and you have a completely fresh install of Windows 11, the computer may not be fully compatible with Windows 11.

John
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  • I failed to mention in the OP that the 3-year old box came with Win-10 Pro factory installed. I did a clean install of Win-11 Pro (Keep Nothing) because the upgrade failed. Still, that doesn't answer my question. I'm looking for information on how to interpret the Kernel-Power events. – Charlie Jul 24 '22 at 09:55
  • Did you update drivers as suggested? – John Jul 24 '22 at 10:35
  • You should also run the Dell Hardware Diagnostic App to test for hardware errors. Answer amended – John Jul 24 '22 at 10:50
  • After doing the Windows-11 clean install, I Used Dell's Command Update app to assure the drivers and BIOS were up to date and appropriate for the box and the Dell Diagnostic app reported no issues. The sleep/wake behavior now seems to be working as desired -- except for the slew of Kernel-Power 566 Information events. As noted in my OP, just trying to learn how to decode the events and cannot find any information as to how to interpret the information they provide. – Charlie Jul 25 '22 at 13:39
  • Based on all your posts, (a) your machine may have a subtle hardware issue (motherboard) or (b) not be fully compatible with Windows 11. The only economical or practical fix I could image now is a more up to date machine. – John Jul 25 '22 at 13:48
  • Two final comments: 1) Microsoft readiness tools repot that my PC is, in fact, fully WIndows-11 capable. 2) In regard to the question in my OP about how to interpret the values reported in Kernel-Power Event 566, I discovered [this](https://superuser.com/questions/323738/what-is-minimum-and-maximum-processor-state-in-windows-7-power-management#429326) post which gives extensive info on P-states and numerous useful links. I believe the numbers in the event log refer to P-states which range from 1-100. Found nothing though about how to interpret the `Reason xx` provided in the event. – Charlie Jul 27 '22 at 10:28