System auto-rebooted... mce: [Hardware Error] in dmesg related to CPU

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I figured out on my motherboard how to apply the “4 point positive curve optimizer” stated as the resolution to Random Reboots (with MCE errors) in the Ryzen - ArchWiki…

  1. First I adjusted PBO from “Auto” => “Advanced”, which opened up 4 more sub-options “left on AUTO” (which was comforting), plus exposed the “Curve Optimizer” I was looking for.
    Screenshot_20211209_144056
    Screenshot_20211209_144056762×196 214 KB

    2.Then once inside “Curve Optimizer” I was able to change the CO from “Disabled” => “All Cores”, and magnitude from “0” => “4”… for my mobo, the sign defaulted to “positive”
    Screenshot_20211209_144516
BIOS save recap...

Screenshot_20211209_144859

I do not believe I have seen a temp increase either with the higher voltage (4pts is ~12-20mv) at idle… memory told me my lowest CPU temp was around 36C, and I have observed 35.88C as the “lowest temp” so far.

Unfortunately/Fortunately so far… I’ve only had a random reboot trigger once (between July 11, 2021 and today Dec 9, 2021)… so it’s going to be difficult for me to validate that “this was 100% my fix”… other than putting some faith in the Arch post being correct.

I also have some confidence in both the updated firmware (AGESA 1.2.0.2) and “Power Idle Control = Typical current idle” working to prevent any freezing (had some odd freezing in the past)… so hopefully the trifecta of changes proves to combine and provide stability over time.

  1. BIOS @ AGESA 1.2.0.2 (will explore AGESA 1.2.0.3 once officially released… i.e. non-beta)
  2. Power Idle Control = Typical current idle
  3. Curve Optimizer = +4 on all cores (noting if +4 doesn’t yield good results, step up slowly/incrementally to +8 if required)

Note:

  • leaving “Global C-State Control = AUTO” until I experience a freeze with #1 or #2
  • switched IOMMU in the BIOS from “AUTO” => “enabled”… although I have not yet explored adding “amd_iommu=on” in grub… or if it’s really necessary as lspci -vvv seems to find it…
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Starship/Matisse IOMMU
        Subsystem: Micro-Star International Co., Ltd. [MSI] Device 7c35
        Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Interrupt: pin ? routed to IRQ 27
        Capabilities: <access denied>
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