On October 29, 2024, Intel released an important microcode update specifically for the 13th and 14th Gen Raptor Lake and Raptor Lake Refresh processors used with Linux systems. This development, announced outside the usual patch schedule, aims to resolve a significant voltage handling issue that has been affecting many users for several months.

Addressing the Voltage Dilemma

The primary focus of the update is to correct a problem with internal voltage requests that could cause unpredictable behavior, as the processor may mistakenly demand increased voltages from the regulator. This issue represents a substantial erratum, heightening the minimum operating voltage requirements and potentially leading to erratic system performance.

Availability and Implementation

For Linux users, the microcode update can be accessed and applied through boot processes or later stages of system loading. Those accustomed to receiving updates via BIOS should note this alternative method, ensuring that even those who do not regularly refresh their BIOS can benefit from this fix. In cases where the hardware has already been adversely affected, an RMA (Return Merchandise Authorization) may be necessary.

Additional Fixes

Beyond the voltage fix, two other corrections are included in this microcode release. One addresses errors in PCONFIG instruction reporting, while the other rectifies an issue related to the out-of-order acknowledgments in USB 3.2 hubs due to Link Credit 1 (LCRD1).

Accessing the Update

The updated microcode is available through GitHub. Users are encouraged to apply these changes promptly to ensure enhanced stability and performance.

For more details, visit the original article on Phoronix.