hi there! i have a strange situation. i have 2 monitors (2K resolution). after loading the OS on the main monitor i got a black desktop with disappeared icons, and i can’t do anything on it (except the system panel), but on the second monitor i can do everything. once i change the monitors priority everything becomes ok.
i attach the link to a video with this behavior.
i would appreciate a hint on how to fix it.
Operating System: openSUSE Tumbleweed 20250611
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.1
Kernel Version: 6.15.1-1-default (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i5-10500 CPU @ 3.10GHz
Memory: 30,9 GiB of RAM
Graphics Processor: Intel® UHD Graphics 630
Manufacturer: ASUS
PS yes, i have and i like the gray background color 
More information than Plasma listed should better help us help you. In Konsole, please run command inxi -GSaz and paste results here using the preformatted text wrapper </> button above the input window. I too have 630 graphics, and have seen no similar issue with 2 or 3 monitors:
$ /sbin/lspci -nnk | grep VGA
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 630 [8086:5912] (rev 04)
$
force update (reinstall) the graphics driver, usually helps me. Only intel no nvidia?
alex@localhost:~> inxi -GSaz
System:
Kernel: 6.15.2-1-default arch: x86_64 bits: 64 compiler: gcc v: 14.3.0
clocksource: tsc avail: hpet,acpi_pm
parameters: BOOT_IMAGE=/boot/vmlinuz-6.15.2-1-default
root=UUID=34af6fef-9af8-4f6c-98ff-38b68f2c3667 splash=silent quiet
security=apparmor mitigations=auto
Desktop: KDE Plasma v: 6.3.5 tk: Qt v: N/A info: frameworks v: 6.14.0
wm: kwin_x11 tools: avail: xscreensaver vt: 2 dm: SDDM Distro: openSUSE
Tumbleweed 20250617
Graphics:
Device-1: Intel CometLake-S GT2 [UHD Graphics 630] vendor: ASUSTeK
driver: i915 v: kernel arch: Gen-9.5 process: Intel 14nm built: 2016-20
ports: active: DP-1,DP-2 empty: DP-3, HDMI-A-1, HDMI-A-2, HDMI-A-3
bus-ID: 00:02.0 chip-ID: 8086:9bc8 class-ID: 0300
Device-2: Logitech Webcam C270 driver: snd-usb-audio,uvcvideo type: USB
rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0 bus-ID: 1-4:3 chip-ID: 046d:0825
class-ID: 0102 serial: <filter>
Display: x11 server: X.Org v: 21.1.15 with: Xwayland v: 24.1.6
compositor: kwin_x11 driver: X: loaded: modesetting unloaded: vesa
alternate: fbdev,intel dri: iris gpu: i915 display-ID: :0 screens: 1
Screen-1: 0 s-res: 5120x1440 s-dpi: 96 s-size: 1354x381mm (53.31x15.00")
s-diag: 1407mm (55.38")
Monitor-1: DP-1 pos: primary,left model: AOC Q24G2 serial: <filter>
built: 2024 res: mode: 2560x1440 hz: 165 scale: 100% (1) dpi: 124 gamma: 1.2
size: 526x296mm (20.71x11.65") diag: 604mm (23.8") ratio: 16:9 modes:
max: 2560x1440 min: 720x400
Monitor-2: DP-2 pos: right model: AOC Q24G2 serial: <filter> built: 2025
res: mode: 2560x1440 hz: 165 scale: 100% (1) dpi: 124 gamma: 1.2
size: 526x296mm (20.71x11.65") diag: 604mm (23.8") ratio: 16:9 modes:
max: 2560x1440 min: 720x400
API: EGL v: 1.5 hw: drv: intel iris platforms: device: 0 drv: iris
device: 1 drv: swrast gbm: drv: iris surfaceless: drv: iris x11: drv: iris
inactive: wayland
API: OpenGL v: 4.6 compat-v: 4.5 vendor: intel mesa v: 25.1.3 glx-v: 1.4
direct-render: yes renderer: Mesa Intel UHD Graphics 630 (CML GT2)
device-ID: 8086:9bc8 memory: 30.22 GiB unified: yes
API: Vulkan v: 1.4.313 layers: 1 device: 0 type: integrated-gpu name: Intel
UHD Graphics 630 (CML GT2) driver: N/A device-ID: 8086:9bc8 surfaces: N/A
device: 1 type: cpu name: llvmpipe (LLVM 20.1.6 256 bits) driver: N/A
device-ID: 10005:0000 surfaces: N/A
Info: Tools: api: eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor wl: wayland-info
x11: xdpyinfo, xprop, xrandr
I don’t see any giveaways in inxi output, though N/A for Qt version seems odd. Did anything change after upgrading to 20250617?
Does a mouse pointer or window moved to the black screen make it disappear? If not, wallpaper might simply be missing for that display, and you should be able to select one.
If you Ctrl-Alt-F4 to leave X, then return with Alt-F2, Alt-F7, or whichever Alt-Fx gets you back into X, does anything change?
If you swap cables between the two monitors and set primary as desired, does either screen remain black?
If you run a Wayland session instead of X11, does the problem remain? What if you open an IceWM session instead of Plasma? If in IceWM both display as expected, it may be worth trying disabling autostart of KScreen in the background, and restarting Plasma session as another troubleshooting step.
If you run inxi -Gxxx, do the two displays’ serial numbers differ?
The most interesting thing is that the problem disappeared when I simply swapped the input cables between the monitors and the monitors themselves. 
I didn’t do anything with the software or settings on my PC. I don’t know what it was)
but huge tnx for help and advises!