How to Fix the Unknown Device ACPI MSFT0101 Error on Lenovo Computers
If you have a Lenovo computer and you see an unknown device with a yellow exclamation mark in Device Manager, you may have a problem with the Security Chip (TPM) setting. The unknown device hardware ID is ACPI MSFT0101, which indicates that the TPM factory default setting is different on Windows 7 and Windows 8 or 10. This error may occur when you try to change your operating system from Windows 8 or 10 to Windows 7 or vice versa.
In this article, we will show you how to fix the unknown device ACPI MSFT0101 error on Lenovo computers by modifying the BIOS setting manually. This solution applies to the following Lenovo ThinkPad models: E460, E560, E465, and E565.
Steps to Fix the Unknown Device ACPI MSFT0101 Error
- Restart your computer and press F1 to enter the BIOS setup.
- Go to Config – Security – Security Chip.
- Use the following table to modify the Security Chip setting according to your system configuration and operating system:
- Press F10 to save and exit the BIOS setup.
- Restart your computer and check if the unknown device ACPI MSFT0101 error is resolved in Device Manager.
| System Configuration | With OS | Security Chip Selection | Security Chip | |
|---|---|---|---|---|
| E460/E560 (Intel platform) | Discrete graphic card (without dTPM) | Windows 8 or 10 | Intel PTT | Enable |
| E460/E560 (Intel platform) | Discrete graphic card (without dTPM) | Windows 7 | Intel PTT | Disable |
| E460/E560 (Intel platform) | UMA (with dTPM) | Windows 8 or 10 | Intel PTT | Enable |
| E460/E560 (Intel platform) | UMA (with dTPM) | Windows 7 | Discrete TPM | Active |
| E465/E565 (AMD platform) | Discrete graphic card (without dTPM) | Windows 8 or 10 | AMD fTPM | Enable |
| E465/E565 (AMD platform) | Discrete graphic card (without dTPM) | Windows 7 | AMD fTPM | Disable |
| E465/E565 (AMD platform) | UMA (with dTPM) | Windows 8 or 10 | AMD fTPM | Enable |
| E465/E565 (AMD platform) | UMA (with dTPM) | Windows 7 | Discrete TPM | Active |
What is TPM and Why Do You Need It?
TPM stands for Trusted Platform Module, which is a hardware chip that provides security features such as encryption, authentication, and integrity for your computer. TPM can protect your data from unauthorized access, tampering, or theft by storing encryption keys, passwords, certificates, and other sensitive information. TPM can also enable features such as BitLocker, Windows Hello, Secure Boot, and Device Guard on Windows operating systems.
There are different types of TPMs depending on the platform and the manufacturer. Intel PTT (Platform Trust Technology) and AMD fTPM (Firmware Trusted Platform Module) are integrated TPMs that are built into the processor or chipset. Discrete TPM is a separate chip that is soldered or plugged into the motherboard. The advantage of discrete TPM is that it has higher security and performance than integrated TPMs. However, discrete TPM may not be compatible with some operating systems or devices.
Conclusion
In this article, we have shown you how to fix the unknown device ACPI MSFT0101 error on Lenovo computers by modifying the BIOS setting manually. This error may occur when you try to change your operating system from Windows 8 or 10 to Windows 7 or vice versa. The unknown device hardware ID is ACPI MSFT0101, which indicates that the TPM factory default setting is different on Windows 7 and Windows 8 or 10. By following the steps above, you can adjust the Security Chip setting according to your system configuration and operating system.
We have also explained what TPM is and why you need it for your computer security. TPM is a hardware chip that provides encryption, authentication, and integrity for your data. There are different types of TPMs depending on the platform and the manufacturer. You should choose the appropriate TPM for your device and operating system compatibility.
We hope this article has been helpful for you. If you have any questions or feedback, please let us know in the comments below.
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