KDE plasma, Wayland session, any Catchyos kernel.
It takes a long time (about a minute) for a taskbar to emerge after login into KDE desktop environment. Sometimes I can see pinned application icons messed and piled up one upon another.
Is it a bug or what?
look for the gpu icon in the system tray and put everything automatic
I see no gpu icon in the system tray
then try all the buttons till you see a pop up about rendering and stuff
My card is AMD Radeon, I use KDE Wayland. See no gpu option in the system tray.
There’s no such an issue on EndeavourOS, for example.
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Can you make a video or so?
Impossible to make any screenshot!
I’m on LTS kernel now. No sound devices, no sound.
Rebooted.
Taskbar freezed, application icons piled, no sound. Mouse cursor disappeared.
Alt+ctrl+del
Rebooted.
Can see sound devices, normal taskbar.
What is it? Fresh system installed on a clean SSD (Sata), No such issues on Endeavour OS on the different drive. Never saw such issues on any distro!
Open Plasma Renderer and set the rendering backend and rendering loop to Automatic if its not already.
Furthermore, show the output of inxi -G
Hi! Thanks for the support!
Plasma Renderer is set for Automatic by default. Nothing to change.
❯ inxi -G
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Cape Verde PRO [Radeon HD
7750/8740 / R7 250E] driver: amdgpu v: kernel
Display: wayland server: X.org v: 1.21.1.13 with: Xwayland v: 24.1.2
compositor: kwin_wayland driver: X: loaded: modesetting dri: radeonsi
gpu: amdgpu resolution: 1920x1200
API: EGL v: 1.5 drivers: kms_swrast,radeonsi,swrast
platforms: gbm,wayland,x11,surfaceless,device
API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 24.2.3-arch1.1
renderer: AMD Radeon HD 7700 Series (radeonsi verde LLVM 18.1.8 DRM 3.54
6.6.50-1-cachyos-lts)
API: Vulkan v: 1.3.295 drivers: radv surfaces: xcb,xlib,wayland
What about the Plasma theme? Can you trying setting it to Breeze if its not already?
Ah well this is weird, its trying to use software drivers. Looks like the reason why its lagging. Add MESA_LOADER_DRIVER_OVERRIDE=radeonsi to /etc/environment and see if it still lags.
This is the fresh install. I touched nothing. I installed Fedora 41 Beta just for the purpose of comparison.
Everything works out-of-the-box. No lags, no freezes of apps. Sound is up and running. Debian, MX-Linux, OpenSUSE Thumbleweed, Manjaro, EndeavourOS, Fedora 40, 41Beta, CACHYOS GNOME don’t have issues of this kind. So all the issues belong to CachiOS KDE Desktop. It is evidentlly buggy.
I added the line to /etc/environment
This file is parsed by pam_env module
Syntax: simple “KEY=VAL” pairs on separate lines
MESA_LOADER_DRIVER_OVERRIDE=radeonsi
========================================
The lag is still here.
I simply can not reproduce this on my machine, but im on nvidia.
But we having multiple AMD users and no one reported something like this.
If youre looking on the hardware detection, it is installing following but doesnt do any configuration or equal for AMD:
You can try as last resort to install mesa-git.
It seems, the issue of lags is somehow connected to the issue of sound. I removed Wireplumber and installed Pipewire Session Manager. Sound is IN, lags are Out! Miracle! Still keeping my fingers crossed.
THANK YOU ALL FOR THE HELP AND SUPPORT! 
I’m going to try doing this on my Steamdeck, as I have a somewhat similar issue when switching to Desktop mode (black screen and mouse pointer, delay before anything shows, sped up by moving the mouse).
I have seen that before. Plasmashell now starts with systemd, and if something in the dependency chain fails it may wait even wait for timeout and behave somewhat flacky. With wireplumber failing that’s possible.
If plasmashell needs n*30 seconds to startup after login then a failing service is usually a good guess.
The riddle is why does it work on Gnome and not on KDE? Why does it work on KDE Endeavour OS and not working on KDE CachyOS (any kernel, including native arch kernels)?