Restart your computer and enter the (usually by pressing F2 , Del , or Esc during boot). Navigate to the Security or Advanced tab.
Search for the Lenovo Power Management Driver or the specific Lenovo ACPI Driver . Acpi Msft0101 Driver Download
While Windows 8, 10, and 11 typically include built-in support for this device, Windows 7 does not support it natively and often requires a specific hotfix. How to Fix the "Unknown Device" ACPI\MSFT0101 Restart your computer and enter the (usually by
It is a core component for modern security features like BitLocker drive encryption and Windows Hello . While Windows 8, 10, and 11 typically include
If the device appears with a yellow exclamation mark, it might be disabled in your system's firmware.
You can use the Intel Driver & Support Assistant to automatically scan for missing chipset or security drivers. 3. Windows 7 Specific Solution (Hotfix KB2920188)
These often require the Intel Management Engine Interface (MEI) or a specific TPM 2.0 update.
