Shutdown impossible, fan running constantly after Cumulative Update KB5073455

Question

Hi!

I'm running Windows 11 Enterprise, OS Version 10.0.22631. BIOS version: LENOVO R2SET29W (1.05 ). System model 21S7S0ER00. Intel processor Family 6 Model 181.

After the latest update KB5073455 I'm experiencing inability to shutdown the computer. Also, a very annoying problem since the latest update is that the computer fan is constantly on since startup. Closing the lid of the laptop will not turn the fan off and will continue until the battery runs out. Because of the corporate environment, I am unable to advancedly control the fans, or for example uninstall the latest update until a fixed one is provided. Do you know when can we expect a fix to be released? Thank you already in advance!

Best regards, Kasper

Answer 1

Hi Kasper,

The behavior you’re describing after KB5073455 is consistent with a regression affecting power management and ACPI interactions on certain Lenovo models. When the update is applied, the system may fail to properly enter shutdown or sleep states, which in turn keeps the fan running continuously. Since you are in a corporate environment where uninstalling the update or manually controlling fan settings is not possible, the best course of action is to monitor for the next cumulative update or out-of-band hotfix, as Microsoft engineering teams are actively investigating this issue.

In the meantime, you can try a temporary workaround by performing a full restart instead of shutdown (using Shift + Restart) or by disabling “Fast Startup” in the power options, which has helped some users mitigate similar symptoms. Additionally, please ensure your BIOS and chipset drivers are fully up to date, as Lenovo often releases firmware updates that improve compatibility with recent Windows builds.

As I know, updates addressing regressions like this are typically rolled into the next cumulative release once validation is complete. I recommend keeping an eye on the Windows release health dashboard for official announcements.

I hope this clarifies the root cause and next steps. If you find this answer helpful, please consider clicking Accept Answer 😊 so I know your concern has been resolved.

Feel free to reply if you need any additional assistance.

Jason.

Answer 2

Hello Kasper,

Just checking in to see whether the issue has been resolved. Let me know if you need any further assistance from my side.

If you found the answer helpful, selecting Accept Answer would be greatly appreciated. 😊