AMD has published Linux kernel patches for an official Ryzen overclocking driver that allows users to adjust CPU power and current limits through a firmware interface exposed via sysfs. Phoronix reports: AMD engineer Shyam Sundar S K posted the patches for the AMD Overclocking "AOD" WMI driver as an interface to the platform firmware for managing overclocking and power/current limits of modern Ryzen CPUs.

The driver in its initial form allows setting via sysfs a number of CPU tunables including the Package Power Tracking (PPT), Thermal Design Current (TDC), and Electrical Design Current (EDC) limits along with reading their supported range. SMT toggling can also be done via the interface as an alternative to the likes of Linux's "nosmt" option in disabling SMT at the platform level rather than kernel disabling. The current memory clocks can also be read via this AOD driver.

The power tunables aren't applied in real-time but go into effect at next reboot. The firmware does support many more commands compared to the few initially wired up and hopefully in time more of these controls will be enabled with this driver.

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