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KB5121003 breaks AMD X470 USB xHCI: DRIVER_POWER_STATE_FAILURE 0x9F
I am reporting what appears to be a USB/xHCI regression immediately following installation of the August 11, 2026 cumulative update KB5121003 on Windows 11 25H2. System information - OS: Wind...
Unplug all non-essential USB devices (like external hard drives, USB hubs), keeping only the mouse and keyboard to rule out peripheral conflicts.