Probably caused by you booting with 'noapic' (fixed in kernel 6.13.x): https://github.com/torvalds/linux/commit/73da582a476ea6e3512f89f8ed57dfed945829a2
A Fedora user found things worked when they switched noapic to pci=nobar ** Summary changed: - linux-generic-hwe-24.04 version 6.11.0-19.19~24.04.1 fail to properly detect CPU core and thread count + linux-generic-hwe-24.04 version 6.11.0-19.19~24.04.1 fail to properly detect CPU core and thread count with 'noapic' -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-meta-hwe-6.11 in Ubuntu. 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 with 'noapic' Status in linux-meta-hwe-6.11 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-meta-hwe-6.11/+bug/2100999/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
