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Ubuntu 20.04, 5.13.0-39-generic AMD Ryzen 9 3900x (12c/24t), B550 Aorus pro (rev 1.0). with recent updates 12 cores out of 24 are not detected. htop only shows 12 , where as it used to show 24 core two weeks back.

  1. Tried updating grub with below options but no positive result.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=off pci=assign-busses apicmaintimer idle=poll reboot=cold,hard acpi=on"
  1. Updated BIOS with latest version.
  2. With Dual boot to windows 10 , all 24 cores are shown !
  3. Tried disabling CCD control from BIOS, This lead to show only 6 cores instead of 12
  4. Tried disabling Global C-State control from BIOS. Nothing improved.

Note: I was using this setup from more than 6 months with 24 cores shown. I wonder what could be wrong.

lscpu shows : Off-line CPU(s) list: 12-23. Any suggestion to make these Off-line CPU to active (to be part of Online) ?

lscpu
...
CPU(s):                          24
On-line CPU(s) list:             0-11
Off-line CPU(s) list:            12-23
Thread(s) per core:              1
Core(s) per socket:              12
Socket(s):                       1
NUMA node(s):                    1
gprasad
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