Created attachment 177769 [details]
Screenshot 1 after fresh boot where both Monitors are listed

SUMMARY
After Suspend, my 2nd Monitor connected via USB-C DP Alt mode is quite dark (reduced brightness - if I remind well, there is a bug still open about it, which should be fixed at Plasma 6.3 according "This Week in Plasma")


STEPS TO REPRODUCE
1. Firtst login after reboot
2. Open Brightness controll -> 2nd Monitor is visible (see screenshot 1)
3. Suspend PC
4. Resume
5. Switch on 2nd Monitor due to still in Suspend
6. login
7. Open Brightness controll -> 2nd Monitor is not visible (see screenshot 2)


OBSERVED RESULT
 2nd Monitor is not listed in the Brightness controll panael

EXPECTED RESULT
 2nd Monitor is listed in the Brightness controll panael


SOFTWARE/OS VERSIONS (from Systeminformation)
Operating System: openSUSE Tumbleweed
Operating System: openSUSE Tumbleweed 20250125
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
Kernel Version: 6.13.0-1-default (64-bit)
Graphics Platform: Wayland
Processors: 8 × AMD Ryzen 7 4700U with Radeon Graphics
Memory: 30.8 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: MINIPC PN50
System Version: 0626

ADDITIONAL INFORMATION
 # inxi -Gxx
Graphics:
  Device-1: Advanced Micro Devices [AMD/ATI] Renoir [Radeon Vega Series /
    Radeon Mobile Series] vendor: ASUSTeK driver: amdgpu v: kernel arch: GCN-5
    pcie: speed: 16 GT/s lanes: 16 ports: active: DP-1,DP-3
    empty: DP-2,HDMI-A-1 bus-ID: 05:00.0 chip-ID: 1002:1636 temp: 66.0 C
  Display: unspecified server: X.org v: 1.21.1.15 with: Xwayland v: 24.1.4
    compositor: kwin_wayland driver: X: loaded: modesetting unloaded: vesa
    alternate: fbdev dri: radeonsi gpu: amdgpu display-ID: :1 screens: 1
  Screen-1: 0 s-res: 5760x2160 s-dpi: 96
  Monitor-1: DP-1 pos: primary,left model: EIZO NANAO EV3285 res: 3840x2160
    hz: 60 dpi: 140 diag: 806mm (31.7")
  Monitor-2: DP-3 pos: right model: ASUS MB16AMT res: 1920x1080 hz: 60
    dpi: 142 diag: 395mm (15.5")
  API: EGL v: 1.5 platforms: device: 0 drv: radeonsi device: 1 drv: swrast
    gbm: drv: radeonsi surfaceless: drv: radeonsi x11: drv: radeonsi
    inactive: wayland
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 24.3.4 glx-v: 1.4
    direct-render: yes renderer: AMD Radeon Graphics (radeonsi renoir LLVM
    19.1.7 DRM 3.59 6.13.0-1-default) device-ID: 1002:1636
  API: Vulkan v: 1.4.304 surfaces: xcb,xlib device: 0 type: integrated-gpu
    driver: N/A device-ID: 1002:1636
  Info: Tools: api: eglinfo, glxinfo, vulkaninfo
    de: kscreen-console,kscreen-doctor wl: wayland-info
    x11: xdpyinfo, xprop, xrandr