Frustrating lag since 6.9.12 kernel update, possible plasmashell bug

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1

Hey everyone, this is my first time here and I’m hoping to get some help with this issue that started when I updated the kernel last Thursday night. I’m running Fedora 40 with KDE, with a Gigabyte GeForce 1060 GTX graphics card, and ever since that last kernel update, my system is frustratingly slow and laggy. There’s a lag with the mouse and keyboard, audio and video are choppy.

I tried booting off the old kernel and that didn’t help, so it’s not a kernel issue.
I tried rebuilding the graphics card drivers, that didn’t help either, so it’s not an Nvidia problem either.
Over at the Ask Fedora forums, we were trying to figure it out and narrowed it down to a bug or crash in plasmashell.

Here’s some relevant system info:

CPU:
  Info: quad core model: Intel Core i5-2500K bits: 64 type: MCP
    arch: Sandy Bridge rev: 7 cache: L1: 256 KiB L2: 1024 KiB L3: 6 MiB
  Speed (MHz): avg: 1685 high: 1925 min/max: 1600/3700 cores: 1: 1605
    2: 1605 3: 1605 4: 1925 bogomips: 26478
  Flags: avx ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3
Graphics:
  Device-1: NVIDIA GP104 [GeForce GTX 1060 6GB] vendor: Gigabyte
    driver: nvidia v: 555.58.02 arch: Pascal pcie: speed: 5 GT/s lanes: 8 ports:
    active: none off: DVI-D-2,HDMI-A-1 empty: DP-1,DVI-D-1 bus-ID: 02:00.0
    chip-ID: 10de:1b83
  Display: wayland server: X.org v: 1.20.14 with: Xwayland v: 24.1.1
    compositor: kwin_wayland driver: X: loaded: nvidia
    unloaded: fbdev,modesetting,vesa alternate: nouveau,nv gpu: nvidia
    d-rect: 3200x900 display-ID: 0
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Anyone have any suggestions? I’ve tried everything I can think of and nothing has worked. I tried reinstalling KDE. I tried removing the Nvidia drivers and reinstalling them. I tried adding nvidia.NVreg_EnableGpuFirmware=0 to the boot parameters. Nothing works and the computer is still almost unusable. I’d really rather not go through the trouble of backing up all my data, wiping the hard drive, and reinstalling Fedora, but if that’s all that’s left I may have to

If it helps, this is what I see from the tail end of journalctl --user -g kwin -b 0:

: kwin_libinput: Libinput: event2  - Logitech USB Optical Mouse: client bug: event processing lagging behind by 36ms, your system is too slow
: kwin_libinput: Libinput: event2  - Logitech USB Optical Mouse: client bug: event processing lagging behind by 38ms, your system is too slow
: kwin_libinput: Libinput: event3  - SIGMACHIP USB Keyboard: client bug: event processing lagging behind by 22ms, your system is too slow
3

Does it occur in x11? I don’t run fedora so im not sure if its in the repo but have you tried the 560 beta drivers? Since I’m on amd can’t replicate that issue. Mind you I was nvida tell may.

4

I wanted to try it on x11, but I found I can’t switch to it. Then I found out that Fedora 40, what I’m using, doesn’t support x11 because Fedora dropped support for it starting with 40.

Haven’t tried the 560 beta drivers, though. I’ll see if I can try that tomorrow or the day after.

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Fedora still supports X11, it just doesn’t include it by default any more, but you can still install it if you want

1 Like
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Hi,

The 6.9.12 kernel is end of life, install the 6.6 (LTS) or 6.10 instead…

https://www.kernel.org/

7

Really? I’ll have to look into that today. Thanks for the tip.

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I’ll have to do that too. For some reason the new kernel has never appeared in the updates which I’ve been running every day.

1 Like
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Well, I’m still stuck. Today I downloaded the new kernel. That alone didn’t fix it, so I found a way to reinstall x11 and switch back to that. And…it’s still F’d up!

Well, at least we know that it’s not a Wayland problem if it still happens in x11.

1 Like
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Maybe try a live iso if it has a current image an see if the issue is also there. i know you reinstalled an all. the only other thing i would say is make a bug report on in on bugs.kde.org cause ya im really not sure

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I made a live USB stick with Fedora 40 with KDE, the same system the machine is using, and tried to boot off of that. And it won’t boot, it just gets stuck in the bootup screen with the Gigabyte logo (the motherboard was made by Gigabyte) and an eternally rotating circle. But! That rotating circle animation is actually smooth, whereas when I try to boot off the hard drive it’s choppy because of the bug. So if this thing could actually boot off the USB it would work fine.

Next I’ll see how to install the Nvidia driver version 560, since the website only has 555 available.

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There’s a ton of nvidia issues with drivers 555/560, and really almost every driver has some quirks. I’d start with the driver thread, and the kernel boot params you’ll find there, as it’s more than the “nvidia.NVreg_EnableGpuFirmware=0”. I typically start with the nvidia forums for upgrade time to see just how broken it’ll be.

I’ve been using 550 driver and still haven’t moved beyond it under arch linux, but get some occasional crashed about once a week.

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Well, unbelievably, it actually works now, and I wasn’t even trying to fix it at the time. I booted it up and strangely, only the right monitor was working, the left monitor wasn’t getting any signal at all. And there was no lag! So was there something wrong with the left monitor?

I turned it all off, unplugged the left monitor’s HDMI cable from the graphics card, plugged it back in, and rebooted. It still worked fine, no lag.

Ah, but that was x11. I switched it to Wayland , then rebooted, and it still worked! Just to be sure, I turned it off, waited several minutes, and then turned it on again. And it STILL WORKS just fine with no lag at all!

But I’m stumped as to why. Why did simply unplugging the left monitor and plugging it back in fix the problem? Is there an issue with the monitor or the HDMI cable, and if so WHY would that cause the graphics card to crack up and make everything laggy? I guess that’s an Nvidia question.

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If they are at different refresh rates that can cause issues in wayland. x11’s way of doing multi monitor will always be a hack so its always had random issues for better or worse.