Windows 11 KB5121003 Is Reportedly Cutting AC Power on Lenovo and HP Laptops

Windows 11 KB5121003 may be causing laptops to repeatedly switch between AC power and battery, even when users leave the charger connected.

Reports point mainly to Lenovo laptops, although HP Victus owners have described similar problems. Some affected systems also experience black screens and GPU interruptions when Windows changes the reported power state.

Windows may incorrectly detect the charger as disconnected

A Reddit user investigated the problem on a Lenovo Legion and believes it could involve changes to Windows battery, ACPI, and power-management components introduced around KB5121003.

According to the report, the laptop’s physical charging indicator remained active while Windows detected the AC connection as disconnected.

That behavior makes a straightforward charger failure less likely, although the available reports do not completely rule out hardware or firmware problems.

The suspected issue could involve communication between Windows, the laptop’s embedded controller, and the ACPI power-management stack.

Removing KB5121003 reportedly stops the disconnects

On the investigated Lenovo system, removing KB5121003 reportedly eliminated the repeated AC power disconnects.

Other Lenovo owners have reported brief AC-to-battery-to-AC transitions accompanied by Kernel-Power Event ID 105.

Users also say uninstalling the update stopped the Event ID 105 entries and the black screens associated with the power-state changes.

HP Victus users report similar problems

The issue may not affect Lenovo systems exclusively.

HP Victus users have also reported AC disconnects after installing KB5121003, with some reports mentioning Kernel-Power Event ID 105.

Some affected HP systems reportedly experience brief GPU reinitialization when Windows switches between AC and battery states.

Microsoft and Lenovo haven’t confirmed the issue

Microsoft and Lenovo have not officially acknowledged an AC power regression linked to KB5121003 or announced a fix. This isn’t the only issue related to this update, and reportedly KB5121003 isn’t installing on some HP, Lenovo, and Dell PCs.

For now, the connection between the update and the power problems comes from individual user reports and investigations rather than an officially documented Windows known issue.

Windows users have reported other update-related problems recently. Windows 11 KB5124008 and KB5126052 are reportedly causing issues on AMD PCs, while other users have encountered USB audio failures following the September update.

Via Neowin