For additional information: I installed the proprietary drivers and KDE
Plasma is super snappy. I am posting from KDE plasma with the binary
drivers ... so, this is clearly a combination of Plasma, Open Source
drivers, Wayland and NVIDIA GPU.

$ apt list |grep installed |grep nvidia

WARNING: apt does not have a stable CLI interface. Use with caution in
scripts.

libnvidia-cfg1-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
libnvidia-common-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
libnvidia-compute-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
libnvidia-decode-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
libnvidia-egl-wayland1/resolute,now 1:1.1.18-1 amd64 [installed,automatic]
libnvidia-encode-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
libnvidia-extra-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
libnvidia-fbc1-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
libnvidia-gl-590/resolute,now 590.48.01-0ubuntu1 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-compute-utils-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
nvidia-dkms-590/resolute,now 590.48.01-0ubuntu1 amd64 [installed,automatic]
nvidia-driver-590/resolute,now 590.48.01-0ubuntu1 amd64 [installed]
nvidia-firmware-580-580.95.05/resolute,now 580.95.05-0ubuntu4 amd64
[installed,auto-removable]
nvidia-firmware-590-590.48.01/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
nvidia-kernel-common-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
nvidia-kernel-source-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]
nvidia-prime/resolute,resolute,now 0.8.17.2build1 all [installed,automatic]
nvidia-settings/resolute,now 510.47.03-0ubuntu6 amd64 [installed,automatic]
nvidia-utils-590/resolute,now 590.48.01-0ubuntu1 amd64 [installed,automatic]
xserver-xorg-video-nvidia-590/resolute,now 590.48.01-0ubuntu1 amd64
[installed,automatic]


On Sun, Jan 25, 2026 at 11:00 AM Leo Milano <[email protected]>
wrote:

> 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
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/2139043
>
> Title:
>   kwin_wayland 4:6.5.5-0ubuntu1 completely taking over the CPU in ubun
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/kwin/+bug/2139043/+subscriptions
>
>

-- 
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
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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