-new- Acpi Msft0101 | Driver 77 2021 !!top!!
It sounds like you have encountered a system device labeled "ACPI MSFT0101" showing an error or missing driver, often associated with the number "77" in hardware IDs.
Hardware Measurement: Uses cryptographic techniques to verify that your software hasn't been tampered with. -NEW- Acpi Msft0101 Driver 77 2021
- TPM 2.0 Requirement: Windows 11 requires a TPM 2.0 chip to install and run.
- Windows Updates: Microsoft pushed several updates to Windows 10 to prepare systems for Windows 11. These updates attempted to "touch" the TPM hardware to ensure it was ready. If your BIOS settings had the TPM disabled, or if the driver handshake failed, the device would get "stuck" in an error state showing up as
ACPI MSFT0101.
1. What is ACPI MSFT0101?
- A CPI = Advanced Configuration and Power Interface (hardware detection standard).
- MSFT0101 = Microsoft’s Hardware ID for a TPM 2.0 device.
- Found on systems with a discrete or firmware-based TPM (Intel PTT, AMD fTPM).
Why it appears
- It can show up after enabling virtualization features (Hyper-V, Windows Sandbox, WSL2 with Hyper-V backend), installing or updating Windows, or when a driver/firmware update changes how devices are enumerated.
- On some systems it appears as an “unknown device” because Windows has no matching vendor-supplied driver and uses a generic ACPI entry instead.
- The “77” you mentioned can correspond to Device Manager’s Code 28 or Code 31/43 family — often indicating missing, unsigned, or incompatible drivers rather than hardware failure.
In 2021, this driver gained significant attention due to the release of Windows 11 It sounds like you have encountered a system
The root cause? Microsoft’s inbox driver (provided via Windows Update) was often generic or outdated. It failed to properly initialize the TPM firmware interface on certain hardware combinations, particularly when the BIOS was in “Discrete TPM” mode vs. “Firmware TPM” (fTPM). WSL2 with Hyper-V backend)
Title: Deep Dive: The "NEW" ACPI MSFT0101 Driver (Version 77) – Finally Solving the TPM 2.0 Conundrum? (2021 Update)