Problem with switching resolution

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1

Hello everyone.
Made the switch from Win 10 to Tumbleweed today. Everything went well as far as I know. Only problem is that when I try to switch the resolution from 3840x2160 to 1920x1080 the upper 80% of the screen are completely blacked out and I have to use xrandr to return to the native resolution. I atempted both the System settings menu and the xrand function. any Ideas?

System:
  Kernel: 6.14.5-1-default arch: x86_64 bits: 64 compiler: gcc v: 14.2.1
    clocksource: tsc avail: hpet,acpi_pm
    parameters: BOOT_IMAGE=/boot/vmlinuz-6.14.5-1-default
    root=UUID=dc64098a-f8d5-4ea3-b2c3-0431bb493d07 splash=silent
    mitigations=auto quiet security=selinux selinux=1
  Desktop: KDE Plasma v: 6.3.5 tk: Qt v: N/A info: frameworks v: 6.13.0
    wm: kwin_x11 tools: avail: xscreensaver vt: 2 dm: SDDM Distro: openSUSE
    Tumbleweed 20250508
Graphics:
  Device-1: NVIDIA TU116 [GeForce GTX 1660] driver: nouveau v: kernel
    alternate: nvidia_drm,nvidia non-free: 550/565.xx+ status: current (as of
    2025-01; EOL~2026-12-xx) arch: Turing code: TUxxx process: TSMC 12nm FF
    built: 2018-2022 pcie: gen: 1 speed: 2.5 GT/s lanes: 16 link-max: gen: 3
    speed: 8 GT/s ports: active: HDMI-A-1 empty: DP-1,DVI-D-1 bus-ID: 2b:00.0
    chip-ID: 10de:2184 class-ID: 0300 temp: 35.0 C
  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,nouveau,nv,nvidia dri: nouveau gpu: nouveau
    display-ID: :0 screens: 1
  Screen-1: 0 s-res: 3840x2160 s-dpi: 96 s-size: 1013x570mm (39.88x22.44")
    s-diag: 1162mm (45.76")
  Monitor-1: HDMI-A-1 mapped: HDMI-1 model: Samsung QBQ90 serial: <filter>
    built: 2022 res: mode: 3840x2160 hz: 30 scale: 100% (1) dpi: 52 gamma: 1.2
    size: 1872x1053mm (73.7x41.46") diag: 1388mm (54.6") ratio: 16:9 modes:
    max: 3840x2160 min: 720x400
  API: EGL v: 1.5 hw: drv: nvidia nouveau platforms: device: 0 drv: nouveau
    device: 1 drv: swrast gbm: drv: nouveau surfaceless: drv: nouveau x11:
    drv: nouveau inactive: wayland
  API: OpenGL v: 4.5 compat-v: 4.3 vendor: mesa v: 25.0.5 glx-v: 1.4
    direct-render: yes renderer: NV168 device-ID: 10de:2184 memory: 5.83 GiB
    unified: no
  API: Vulkan v: 1.4.309 layers: 5 device: 0 type: cpu name: llvmpipe (LLVM
    20.1.3 256 bits) driver: N/A device-ID: 10005:0000 surfaces: xcb,xlib
  Info: Tools: api: eglinfo, glxinfo, vulkaninfo
    de: kscreen-console,kscreen-doctor wl: wayland-info
    x11: xdpyinfo, xprop, xrandr
2

No 1 rule:
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3

Attempted to switch using what procedure?

4

I removed the windows 10 SSD from my PC, plugged a new and empty one in. Then I flashed a USB drive with the ISO of Tumbleweed using Etcher and installed it.

5

How is that switching the resolution from 3840x2160 to 1920x1080?

6

Sorry, a bit of a misunderstanding.
First attempt was the Systems settings program. Went to Display & Monitor, Display Configuration and set the Resolution to 1920x1080 and the refresh rate to 120 via Dropdown menus.
The second atempt was via the Console command xrand --output HDMI-1 --mode 1920x1080 --rate 120. The reset to native i got by xrand --output HDMI-1 --auto

7

Does xrandr --output HDMI-1 --mode 1920x1080 --rate 60 produce the same failure? How about xrandr --output HDMI-1 --mode 2560x1440 and xrandr --output HDMI-1 --mode 2048x1152?

8

Have you tried using Wayland?

X worked great for me with an Intel ARC A750. Then I had problems with the title bar and window buttons having a wide line tough them and the buttons didn’t always work.

I had tried Wayland but it had problems so I used X. Then Wayland became better and X was worse with other graphical issues. Wayland is great for me now.

Also, Wayland is now working on my friends Tumbleweed with an Nvidia 4070 using the official Nvidia drivers. It wasn’t usable at first but it has improved considerably.

If you don’t know, at the login screen, look in the bottom left corner and you can select Plasma X11 or Plasma Wayland. Then login.

Also, various Desktop Effects in System Settings can cause issues. You can disable them one at a time and see if one of those are causing problems.

And why are you wanting to use 1080?
A scale factor of 1.40 - 1.50 will give you a nice desktop in 3840 x 2160.

I understand that it should do 1080 with no problem and I’d want mine working too, even if I wasn’t going to use it.

I haven’t heard of this problem. Using Wayland may fix it. I’ll Google it and see if I can find anything.

Try Wayland.

You can also try changing the resolution to 1080 when using X, then turn the monitor off and back on. Mine wakes up in the wrong resolution sometimes and I can get back to 4K, but I can’t change the refresh rate above 30 Hz.

Power cycling the monitor allows me to select a higher refresh rate. It may make it reselect the 1080 mode and fix it. It’d be a good clue.