Comment # 94 on bug 1222156 from Sebastian Kuhne

Finally, I made it to 6.8.9:

Operating System: openSUSE Tumbleweed 20240624
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Kernel Version: 6.8.9-1-default (64-bit)
Graphics Platform: X11
Processors: 4 × AMD A8-7650K Radeon R7, 10 Compute Cores 4C+6G
Memory: 14.6 GiB of RAM
Graphics Processor: KAVERI


Findings:

Wayland is not working, X11 does. No change in behaviour.

sudo inxi 3.3.35-00 (2024-06-18)
Machine:
  Type: Desktop Mobo: ASRock model: FM2A78M Pro4+ serial: M80-3C012001343
    UEFI-[Legacy]: American Megatrends v: P2.40 date: 02/05/2016
CPU:
  Info: quad core model: AMD A8-7650K Radeon R7 10 Compute Cores 4C+6G bits: 64
type: MT MCP
    cache: L2: 4 MiB
  Speed (MHz): avg: 1900 min/max: 1900/3800 cores: 1: 1900 2: 1900 3: 1900 4:
1900

sudo inxi -GSaz
System:
  Kernel: 6.8.9-1-default arch: x86_64 bits: 64 compiler: gcc v: 13.2.1
clocksource: tsc
    avail: hpet,acpi_pm parameters: BOOT_IMAGE=/boot/vmlinuz-6.8.9-1-default
    root=UUID=46dfafac-fbe2-48eb-b037-156c4bb3d053 resume=/dev/sda1 showopts
loglevel=3
  Console: pty pts/2 DM: SDDM Distro: openSUSE Tumbleweed 20240624
Graphics:
  Device-1: AMD Kaveri [Radeon R7 Graphics] vendor: ASRock driver: radeon v:
kernel
    alternate: amdgpu arch: GCN-2 code: Sea Islands process: GF/TSMC 16-28nm
built: 2013-17 ports:
    active: HDMI-A-1 empty: DVI-D-1,VGA-1 bus-ID: 00:01.0 chip-ID: 1002:1313
class-ID: 0300
  Device-2: Sunplus Innovation hama C-600 Pro Webcam driver:
snd-usb-audio,uvcvideo type: USB
    rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-4:4 chip-ID:
1bcf:28c4 class-ID: 0102
    serial: <filter>
  Display: server: X.org v: 1.21.1.12 with: Xwayland v: 24.1.0 compositor:
kwin_x11 driver: X:
    loaded: radeon unloaded: fbdev,modesetting,vesa dri: radeonsi gpu: radeon
tty: 270x68
  Monitor-1: HDMI-A-1 model: Asus VS247 serial: <filter> built: 2015 res:
1920x1080 dpi: 94
    gamma: 1.2 size: 521x293mm (20.51x11.54") diag: 598mm (23.5") ratio: 16:9
modes: max: 1920x1080
    min: 720x400
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi
device: 1 drv: swrast
    gbm: drv: radeonsi surfaceless: drv: radeonsi inactive: wayland,x11
  API: OpenGL v: 4.5 vendor: mesa v: 24.1.2 note: console (EGL sourced)
renderer: KAVERI
    (radeonsi LLVM 18.1.6 DRM 2.50 6.8.9-1-default), llvmpipe (LLVM 18.1.6 256
bits)
  API: Vulkan v: 1.3.283 layers: 2 device: 0 type: cpu name: llvmpipe (LLVM
18.1.6 256 bits)
    driver: N/A device-ID: 10005:0000 surfaces: N/A

Potential summary: The kernel is not the root cause(?)