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Linux Gets Fix For AMD Zen 3 CPU Frequency Handling Stemming From 8 Year Old Workaround

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  • Linux Gets Fix For AMD Zen 3 CPU Frequency Handling Stemming From 8 Year Old Workaround

    Phoronix: Linux Gets Fix For AMD Zen 3 CPU Frequency Handling Stemming From 8 Year Old Workaround

    Since 2012 there has been a quirk in the Linux kernel to disable/override using ACPI _PSD data on all AMD processors as a workaround in turn for Windows-specific behavior that clashes with the semantics of the Linux ACPI CPUFreq driver for CPU frequency scaling. With AMD Zen 3 this quirk is no longer needed to behave correctly and thus Linux 5.10 is going to drop this eight year old quirk on Zen 3 and newer...

    http://www.phoronix.com/scan.php?pag...-CPUFreq-Quirk

  • #2
    I always wondered what that line in the kernel logs about overriding _PSD data meant... now I know.

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    • #3
      "zen-again"...what if I want to revert and try the old way is there a kernel boot option ?

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      • #4
        Originally posted by onlyLinuxLuvUBack View Post
        "zen-again"...what if I want to revert and try the old way is there a kernel boot option ?
        This change only affects Zen 3, so Ryzen 5000 series. As these processors are unreleased, there's no old way to go back to.

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        • #5
          Originally posted by QwertyChouskie View Post

          This change only affects Zen 3, so Ryzen 5000 series. As these processors are unreleased, there's no old way to go back to.
          The change also works with zen1+2, amd most likey just validated it on the zen3 reference bios. I didn't notice any slowdowns or speedups with it though.

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