Comment # 69 on bug 1222156 from Felix Miata

I was able to revert on my GCN #1 Slowroll installation to the following:
Mesa-23.3.6-367.1.x86_64.rpm
Mesa-dri-23.3.6-367.1.x86_64.rpm
Mesa-gallium-23.3.6-367.1.x86_64.rpm
Mesa-libEGL1-23.3.6-367.1.x86_64.rpm
Mesa-libGL1-23.3.6-367.1.x86_64.rpm
Mesa-libOpenCL-23.3.6-367.1.x86_64.rpm
Mesa-libd3d-23.3.6-367.1.x86_64.rpm
Mesa-libglapi0-23.3.6-367.1.x86_64.rpm
Mesa-libva-23.3.6-367.1.x86_64.rpm
Mesa-vulkan-device-select-23.3.6-367.1.x86_64.rpm
Mesa-vulkan-overlay-23.3.6-367.1.x86_64.rpm
libLLVM17-17.0.6-1.16.x86_64.rpm
libLLVMSPIRVLib17-17.0.0-3.2.x86_64.rpm
libSPIRV-Tools-2023_6_rc1-2023.6~rc1-4.2.x86_64.rpm
libclang-cpp17-17.0.6-1.16.x86_64.rpm
libclc-0.2.0+llvm17.0.1-2.2.noarch.rpm

The result is it is not now required to use any radeon or amdgpu graphics
options on kernel cmdline for X11/XDM to function normally:
# inxi -GSaz --vs
inxi 3.3.34-00 (2024-04-13)
System:
  Kernel: 6.8.7-1-default arch: x86_64 bits: 64 compiler: gcc v: 13.2.1
    clocksource: tsc avail: hpet,acpi_pm parameters: root=LABEL=w71p19sslo
    ipv6.disable=1 net.ifnames=0 noresume
  Desktop: KDE Plasma v: 5.27.10 tk: Qt v: 5.15.12 info: frameworks
    v: 5.115.0 wm: kwin_x11 vt: 7 dm: XDM Distro: openSUSE Tumbleweed-Slowroll
    20240405
Graphics:
  Device-1: AMD Oland [Radeon HD 8570 / R5 430 OEM R7 240/340 Radeon 520 OEM]
    vendor: Dell driver: radeon v: kernel alternate: amdgpu arch: GCN-1
    code: Southern Islands process: TSMC 28nm built: 2011-20 pcie: gen: 1
    speed: 2.5 GT/s lanes: 8 link-max: gen: 3 speed: 8 GT/s ports:
    active: DP-1,DVI-I-1 empty: none bus-ID: 01:00.0 chip-ID: 1002:6611
    class-ID: 0300 temp: 51.0 C
  Display: x11 server: X.Org v: 21.1.12 compositor: kwin_x11 driver: X:
    loaded: radeon unloaded: modesetting alternate: fbdev,vesa dri: swrast
    gpu: radeon display-ID: :0 screens: 1
  Screen-1: 0 s-res: 4240x1440 s-dpi: 120 s-size: 897x304mm (35.31x11.97")
    s-diag: 947mm (37.29")
  Monitor-1: DVI-I-1 mapped: DVI-0 pos: right model: Dell P2213
    serial: <filter> built: 2012 res: 1680x1050 hz: 60 dpi: 90 gamma: 1.2
    size: 473x296mm (18.62x11.65") diag: 558mm (22") ratio: 16:10 modes:
    max: 1680x1050 min: 720x400
  Monitor-2: DP-1 mapped: DisplayPort-0 pos: primary,left
    model: Acer K272HUL serial: <filter> built: 2018 res: 2560x1440 hz: 60
    dpi: 109 gamma: 1.2 size: 598x336mm (23.54x13.23") diag: 686mm (27")
    ratio: 16:9 modes: max: 2560x1440 min: 720x400
  API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi
    device: 1 drv: swrast surfaceless: drv: radeonsi x11: drv: swrast
    inactive: gbm,wayland
  API: OpenGL v: 4.5 vendor: mesa v: 23.3.6 glx-v: 1.4 direct-render: yes
    renderer: llvmpipe (LLVM 17.0.6 128 bits) device-ID: ffffffff:ffffffff
    memory: 7.58 GiB unified: yes
  API: Vulkan v: 1.3.280 layers: 1 device: 0 type: cpu name: llvmpipe (LLVM
    18.1.2 128 bits) driver: N/A device-ID: 10005:0000 surfaces: xcb,xlib
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