Public bug reported:
I am testing Ubuntu 26.04 on a spare partition. This is an upgrade from
25.10. Logging into KDE Plasma is simply unusable in my system. Even
trying to open a menu to get some diagnostics is nearly impossible. But
I could ctrl-alt-t to a terminal, and run top: kwin_wayland is taking
most of the cores cpu, at almost 1600%, with 16 threads available.
Memory usage by the process is low.
regular Ubuntu login is super snappy. Happy to test if it helps, this is
an LTS so I thought I would drop a report.
### Release
$ lsb_release -rd
Description: Ubuntu Resolute Raccoon (development branch)
Release: 26.04
### Package version
$ apt-cache policy kwin-wayland
kwin-wayland:
Installed: 4:6.5.5-0ubuntu1
Candidate: 4:6.5.5-0ubuntu1
Version table:
*** 4:6.5.5-0ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu resolute/universe amd64 Packages
100 /var/lib/dpkg/status
### Nvidia GPU
$ lspci |grep -i vga
05:00.0 VGA compatible controller: NVIDIA Corporation GA106 [GeForce RTX 3060
Lite Hash Rate] (rev a1)
### Nvidia graphics stack: open-source; Synaptic also reports no prop drivers
in use.
$apt list |grep installed |grep nvidia
WARNING: apt does not have a stable CLI interface. Use with caution in
scripts.
libnvidia-compute-580/resolute,now 580.95.05-0ubuntu4 amd64
[installed,automatic]
linux-modules-nvidia-535-generic/resolute,now 6.18.0-9.9+1 amd64 [installed]
linux-modules-nvidia-580-6.18.0-8-generic/resolute,now 6.18.0-8.8 amd64
[installed,automatic]
linux-modules-nvidia-580-6.18.0-9-generic/resolute,now 6.18.0-9.9+1 amd64
[installed,automatic]
linux-modules-nvidia-580-generic/resolute,now 6.18.0-9.9+1 amd64
[installed,automatic]
linux-objects-nvidia-580-6.18.0-8-generic/resolute,now 6.18.0-8.8 amd64
[installed,automatic]
linux-objects-nvidia-580-6.18.0-9-generic/resolute,now 6.18.0-9.9+1 amd64
[installed,automatic]
linux-signatures-nvidia-6.18.0-8-generic/resolute,now 6.18.0-8.8 amd64
[installed,automatic]
linux-signatures-nvidia-6.18.0-9-generic/resolute,now 6.18.0-9.9+1 amd64
[installed,automatic]
nvidia-firmware-580-580.95.05/resolute,now 580.95.05-0ubuntu4 amd64
[installed,automatic]
nvidia-kernel-common-580/resolute,now 580.95.05-0ubuntu4 amd64
[installed,automatic]
nvidia-prime/resolute,resolute,now 0.8.17.2build1 all [installed,automatic]
** Affects: kwin (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2139043
Title:
kwin_wayland 4:6.5.5-0ubuntu1 completely taking over the CPU in ubun
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