Marking Incomplete, I upgraded to Jammy where this is no longer a
problem
** Changed in: linux-signed-hwe-5.13 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1969612
Title:
5.13.0-40 extremely slow with Alder Lake CPU
Status in linux-signed-hwe-5.13 package in Ubuntu:
Incomplete
Bug description:
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)
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