Big bug in plasma 6 on wayland - Back to driver 550

Ridrok · Last edited by Ridrok on Tue Oct 29, 2024 6:45 am; edited 2 times in total

Hi,

I have like many others (found on redit). The problem is that kwin_wayland takes lot of CPU doing nothing.
For me it's 25% of a core on a Ryzen 5900X.
Sometimes after a reboot it's solved, but I can restart several time and have the bug.
I red it's about xwayland doing wrong stuff.

No time to investigate this, but I think I will stop wayland and go back to X11 in near future.
I like wayland for the speed, but this bug is a problem.

So if anyone has a solution... Or maybe a new version of plasma 6 will fix it.

I am up-to date
Plasma 6.1.5
KDE Framework 6.6.0
Kernel 6.6.52
Wayland

CooSee · Veteran Joined: 20 Nov 2004 Posts: 1468 Location: Earth

please https://wiki.gentoo.org/wiki/Wgetpaste your users .local/share/sddm/wayland-session.log

it smells like a Nvidia issue or are you using iGPU ?

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Ridrok · Posted: Sat Oct 26, 2024 7:32 am Post subject:

It's a desktop PC, Ryzen 5900X, nVidia RTX 3090, 64GB memory, no other GPU

https://bpa.st/DQXA

Ridrok · Posted: Sat Oct 26, 2024 8:21 am Post subject:

Found a fix ... I did update to nVidia driver 560.35 because I am developing NVML application and wanted to have the last version.
I reverted back to the Gentoo version 550 and the bug is gone.

kwin_wayland using 25% of a core was present as soon as I started Thunderbird and would disappear around 30% of the time by closing Thunderbird. But Thunderbird was not the only one to exhibit this problem.

But unfortunately, I miss some functions added in driver 555. So will try to get this 555 version.

Ridrok · Posted: Sat Oct 26, 2024 5:13 pm Post subject:

Driver 565 are working properly and have the nvml commands I need.

Ridrok · Posted: Tue Oct 29, 2024 6:48 am Post subject:

In fact driver 565 is better but also faces the problem as soon as the PC enter DPMS, when resuming, bam 25-30% cpu used by kwin_wayland.
So no choice but drop some NVML code and back to driver 550 until Plasma fix their stuffs with newer drivers.

That is a shame since I can't progress anymore on nVidia card management.

Hu · Administrator Joined: 06 Mar 2007 Posts: 22694

Could you link to the bug report(s) for Plasma, so that interested parties can see when the developers have a proposed fix available?