Public bug reported: System running i5-12400F CPU, this is Alder Lake with 6x performance cores (no efficiency cores).
Booting with linux-image-5.13.0-40-generic is extremely slow. The system takes over a minute to even log in, usual time is a few seconds. Running anything even remotely taxing (eg: GRUB rebuild, sudo) effectively grinds the system to a halt. I notice CPU scaling never reaches above ~1 Ghz, whereas normal operation on 5.13.0-39 and earlier reaches up to ~4.7 GHz on demand. When 5.13.0-40 is booted, the CPU Frequency Scaling applet in MATE Desktop does not display the powersave/performance governors. sysfs shows the intel_pstate driver in use, running in powersave governor. Booting back into 5.13.0-39 resolves this, the system is fast and responsive again. Nothing jumps out as obvious to me in the changelog: https://changelogs.ubuntu.com/changelogs/pool/main/l/linux/linux_5.13.0-40.45/changelog (searched "cpu" and "freq" and "alder"). As per https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies I would gladly test the latest upstream mainline build, however it's not possible to install v5.15.7 or later due to unmet libssl3 dependency. $ lsb_release -rd Description: Ubuntu 20.04.4 LTS Release: 20.04 $ apt-cache policy linux-image-5.13.0-40-generic linux-image-5.13.0-40-generic: Installed: 5.13.0-40.45~20.04.1 Candidate: 5.13.0-40.45~20.04.1 Version table: *** 5.13.0-40.45~20.04.1 500 500 http://au.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages 100 /var/lib/dpkg/status ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.13.0-40-generic 5.13.0-40.45~20.04.1 ProcVersionSignature: Ubuntu 5.13.0-39.44~20.04.1-generic 5.13.19 Uname: Linux 5.13.0-39-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.23 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: MATE Date: Wed Apr 20 20:41:52 2022 InstallationDate: Installed on 2022-03-17 (33 days ago) InstallationMedia: Ubuntu-MATE 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223) SourcePackage: linux-signed-hwe-5.13 UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-signed-hwe-5.13 (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1969612 Title: 5.13.0-40 extremely slow with Alder Lake CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.13/+bug/1969612/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
