Public bug reported:
Not sure if this is exactly the package that is experiencing/causing the
issue or if the root is elsewhere, but this is the most obvious break to
me in a long list of things that seem to be wrong with power management
in 22.04 LTS. I could not find similar bugs via google or the
suggestions, but I am hoping someone else may be able to link this to a
similar one if it exists.
On multiple machines (one thinkpad laptop, one custom built desktop)
running 22.04 with AMD processors, I notice odd behavior where what is
selected in settings under 'Power Settings' does not seem to change
anything, and at least does not match what is reported by `cat
/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor`. From some
limited sysbench testing, it seems the only real way to set this is
echoing the desired profile into that location, but it seems to randomly
switch back on occasion and always on reboot to powersave (settings
still show performance mode when this happens).
Reproduction:
- From fresh boot with default power settings, check current scaling with `cat
/sys/devices/system/cpu/cpu*/cpufreq/scaling_governor` and compare with what is
shown in the power settings of the settings GUI
- Change the setting in the GUI
- Compare again, and note that they do not match
I will include some other basic details, and I would be happy to assist
in any troubleshooting or data collection needed to get power management
into a better state for Ubuntu.
CPUs affected:
AMD Ryzen 9 7950X 16-Core (desktop)
AMD Ryzen 7 PRO 6850H (thinkpad P15v gen3, with latest BIOS update v1.20)
CPU Governor/scaling driver: amd-pstate-epp
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome-control-center 1:41.7-0ubuntu0.22.04.8
ProcVersionSignature: Ubuntu 6.5.0-35.35~22.04.1-generic 6.5.13
Uname: Linux 6.5.0-35-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu May 23 16:56:06 2024
InstallationDate: Installed on 2023-12-06 (169 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64
(20220809.1)
ProcEnviron:
SHELL=/bin/bash
LANG=en_US.UTF-8
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
PATH=(custom, no user)
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gnome-control-center (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug jammy
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https://bugs.launchpad.net/bugs/2066988
Title:
Power setting in settings unrelated to actual power settings
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