[Bug 2100999] Re: linux-generic-hwe-24.04 version 6.11.0-19.19~24.04.1 fail to properly detect CPU core and thread count

[SunBear]

Another point worth noting. The issue that I have reported does not
occur when I boot in via Linux 6.11.0-19-generic (recovery mode) but
occurs for Linux 6.11.0-19-generic.

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https://bugs.launchpad.net/bugs/2100999

Title:
  linux-generic-hwe-24.04 version 6.11.0-19.19~24.04.1 fail to properly
  detect  CPU core and thread count

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  After doing `sudo apt upgrade`, the above mentioned linux hwe kernel
  was installed.

  Start-Date: 2025-03-05  15:02:08
  Commandline: apt upgrade
  Requested-By: user (1000)
  Install: linux-objects-nvidia-470-6.11.0-19-generic:amd64 (6.11.0-19.19~24.04.1, automatic), linux-hwe-6.11-tools-6.11.0-19:amd64 (6.11.0-19.19~24.04.1, automatic), linux-modules-extra-6.11.0-19-generic:amd64 (6.11.0-19.19~24.04.1, automatic), linux-modules-nvidia-470-6.11.0-19-generic:amd64 (6.11.0-19.19~24.04.1, automatic), linux-image-6.11.0-19-generic:amd64 (6.11.0-19.19~24.04.1, automatic), linux-tools-6.11.0-19-generic:amd64 (6.11.0-19.19~24.04.1, automatic), linux-signatures-nvidia-6.11.0-19-generic:amd64 (6.11.0-19.19~24.04.1, automatic), linux-hwe-6.11-headers-6.11.0-19:amd64 (6.11.0-19.19~24.04.1, automatic), linux-headers-6.11.0-19-generic:amd64 (6.11.0-19.19~24.04.1, automatic), linux-modules-6.11.0-19-generic:amd64 (6.11.0-19.19~24.04.1, automatic)
  Upgrade: linux-headers-generic-hwe-24.04:amd64 (6.8.0-52.53, 6.11.0-19.19~24.04.1), linux-generic-hwe-24.04:amd64 (6.8.0-52.53, 6.11.0-19.19~24.04.1), linux-tools-common:amd64 (6.8.0-54.56, 6.8.0-55.57), google-chrome-stable:amd64 (133.0.6943.141-1, 134.0.6998.35-1), linux-modules-nvidia-470-generic-hwe-24.04:amd64 (6.8.0-52.53, 6.11.0-19.19~24.04.1), linux-image-generic-hwe-24.04:amd64 (6.8.0-52.53, 6.11.0-19.19~24.04.1), linux-libc-dev:amd64 (6.8.0-54.56, 6.8.0-55.57)
  End-Date: 2025-03-05  15:03:19

  After rebooting, the new linux kernel fails to correctly detect the
  CPU core and thread count. This system CPU has 16 cores, 32 threads
  and System Monitor normally shows 32 CPU virtual cores. After the
  upgrade, System Monitor now shows only 1 CPU virtual core. The upgrade
  corrupted my system.

  
  To circumvent this issue, I have to boot Ubuntu 24.04 using the linux-image-6.8.0-52-generic 6.8.0-52.53 kernel and not use the hwe kernel.

  I have submitted the relevant `ubuntu-bug` report.

  How do I fix this issue?

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: ubuntu-release-upgrader-core 1:24.04.22 [origin: unknown]
  ProcVersionSignature: Ubuntu 6.11.0-19.19~24.04.1-generic 6.11.11
  Uname: Linux 6.11.0-19-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashDB: ubuntu
  CrashReports: 640:1000:109:51661892:2025-03-03 02:30:21.363597393 +0800:2025-03-04 00:28:42.503056252 +0800:/var/crash/_opt_brave.com_brave_brave.1000.crash
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Mar  6 12:16:18 2025
  InstallationDate: Installed on 2024-12-07 (89 days ago)
  InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827.1)
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   XDG_RUNTIME_DIR=<set>
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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