AMD PCs stutter on Windows 10 and 11 due to fTPM bug, workaround

For a month or two, AMD's Ryzen processors have been found to stutter (via Reddit ) or freeze on Windows 10 and 11 systems with firmware TPM (fTPM) enabled. Today, AMD issued an announcement after determining the cause of these issues.

According to the company, the hangs and stuttering are caused by extended memory transaction operations within the Serial Peripheral Interface (SPI) flash ROM.

AMD has determined that select AMD Ryzen™ system configurations may intermittently perform fTPM-related extended memory transactions in the SPI flash memory ("SPIROM") located on the motherboard, which may Causes a temporary suspension of system interactivity or responsiveness until the transaction ends.

In addition to this, the advisory also contains a workaround. Additionally, the company said it will permanently address the issue with AMD Generic Packaging Software Architecture (AGESA) update 1207, which will be released later this May. Basically, when this happens, users will have to update their motherboard firmware.

Updates and Workarounds

Update:Affected PCs will require a motherboard system BIOS (sBIOS) update that contains the Enhancement module for fTPM and SPIROM interaction. AMD expects flashable customer sBIOS files to be available starting in early May 2022. The exact BIOS availability for a specific motherboard depends on the manufacturer's testing and integration plans. Flashable updates to motherboards will be based on AMD AGESA 1207 (or higher).

Workaround: As a straightforward workaround, affected customers who rely on fTPM functionality for Trusted Platform Module support may instead use a hardware TPM ("dTPM") device. Trusted computing. The platform dTPM module utilizes on-board non-volatile memory (NVRAM) to replace the TPM/SPIROM interaction described in this article.

Compatibility: Before attempting or implementing this workaround, please confirm with your system or motherboard manufacturer that your platform supports additional dTPM modules.

WARNING: If switching an active system from fTPM to dTPM, it is critical to disable TPM-supported encryption systems (such as BitLocker Drive Encryption) and/or back up important system data before switching TPM devices important. You must have full administrative rights to the system, or if the system is managed, you must have explicit support from an IT administrator. For more information about transferring ownership to a new TPM device, visit this Microsoft webpage.

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