Updated AMD P-State Driver Posted For Improving Linux Power Efficiency
Written by Michael Larabel in AMD on 19 November 2021 at 06:55 AM EST. 31 Comments
AMD --
A fourth iteration of the AMD P-State CPU frequency scaling driver patches for Linux have been sent out for review and testing.

This is the amd-pstate driver aiming for better power efficiency on Linux by leveraging ACPI CPPC found with Zen 2 and newer processors. Valve collaborated with AMD on the creation of this new driver that aims to be superior to the generic ACPI CPUFreq driver currently used by AMD processors. This driver has been undergoing public review since September with aims to make it to the mainline kernel.


With today's amd-pstate v4 series, the driver has been re-based against the upstream Linux 5.15 state for the power management branch, cleaning up some of the code, introduction of an AMD CPPC support library, an option to disable shared memory support, and other low-level improvements to the driver code. The v4 series can be found via the kernel mailing list.

It's been a revision or two ago since I last tested the amd-pstate driver to mixed success, so will take these fresh patches for a spin shortly. The timing of this driver though makes it out of reach for mainlining in Linux 5.16 but we'll see if it's squared away in time for v5.17.
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