The device ID typically refers to the Intel Platform Trust Technology (PTT) or a Trusted Platform Module (TPM) 2.0 chipset component. For many users, this device appears as an "Unknown Device" in the Windows Device Manager after a fresh installation or major update. What is the ACPI MSFT0101 Device?
: Some manufacturers, such as Lenovo , released specific ACPI driver packages in late 2021 (e.g., version 21H2) to ensure compatibility with Windows 11. How to Fix "Missing Driver" Errors -NEW- Acpi Msft0101 Driver 77 2021
If you see a yellow exclamation mark next to "Unknown Device" with the hardware ID ACPI\MSFT0101 The device ID typically refers to the Intel
: Download the Lenovo ACPI Driver (updated in late 2021) for full Windows 11 compatibility. 3. Manual Update via Device Manager If you have downloaded the driver files: Right-click the Start button and select Device Manager . Find the Unknown Device or Trusted Platform Module 2.0 . Right-click and select Update driver . : Some manufacturers, such as Lenovo , released
The driver refers to the Microsoft Trusted Platform Module (TPM) 2.0 device, which is a critical security component for modern Windows systems. Driver Details & Identification Device ID: ACPI\MSFT0101 or ACPI\PNP0C31 .
If the error persists after all steps, your TPM chip might be (rare) — disable it in BIOS and use software encryption instead.
