Power consumption much higher after switching to Ubuntu 24.04

[pinus]

I have desktop pc, AMD platform, also AMD graphics card. It was running Ubuntu 20.04. Because I switched the graphics card I plugged my system on a power meter. After the switch, the installation consumed ~100W.

Some weeks later I installed Ubuntu 24.04. The bad experience is a different story. I managed to get it running. Now the System consumes 190W. No hardware changes!

CPU load shows ~0, LAMP shows ~7W for the graphics card. All disks spin down after 15 minutes. Nothing could explain 90W. Even the CPU is limited in the BIOS to 65W.

Is it possible that the new Ubuntu overwrites the power limit of the CPU?

[pinus (pinus)]

Found a nice tool showing that it is running at much to high clock speed for doing nothing. With energy savings activated in the GNOME settings.

cpupower frequency-info
analyzing CPU 2:
  driver: acpi-cpufreq
  CPUs which run at the same hardware frequency: 2
  CPUs which need to have their frequency coordinated by software: 2
  maximum transition latency: Cannot determine or is not supported.
  hardware limits: 2.20 GHz - 4.95 GHz
  available frequency steps: 3.70 GHz, 2.80 GHz, 2.20 GHz
  available cpufreq governors: conservative ondemand userspace powersave performance schedutil
  current policy: frequency should be within 2.20 GHz and 3.70 GHz.
                  The governor "schedutil" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 4.06 GHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: no

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Libera.chat.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/2064847/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[pinus (pinus)]

I figured out that the USB boot stick didn't have the problem. I also figured out that the power consumption on the login screen is below 100W.
If I login to Ubuntu the power consumption raises about 50W, no matter of X or Wayland. I created a new user without my settings and plugins but still ~50W raise. I installed KDE Plasman, which doesn't have this problem, power consumption stays at ~100W.

Which package is responsible for the Ubuntu desktop?