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I have a Supermicro A3SPI-8C-LN6PF board which features an embedded Intel Atom C5325 CPU running Proxmox (Debian 11.6, Kernel 6.2.11). dmesg is reporting intel_pstate: CPU model not supported and I'm wondering what could be the reason. I also noticed that the CPU package power draw is around ~21W when idling (scaling_governor=ondemand, all cores at 800 MHz) which seems a bit high? More interestingly the power draw only increase to ~28W when running a synthetic load on all cores @ 2400 MHz.

In the BIOS the following settings are set:

  • SpeedStep (P-States) enable
  • EIST PSD Function: HW_ALL or SW_ALL; no difference observable.
  • Turbo Mode: enable
  • Enable Monitor MWAIT: enabled
  • CPU C6 Report: enable
  • Enhanced Halt State (C1E): enable
  • Software Controlled T-States: disable
  • PCIe ASPM Support (Global): auto
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