Cannot enable second screen on arch linux KDE 6

Hello, I have been trying to find the solutions for hours and I cannot find it, basically when I go in the kscreen manager setting and enable my second screen it auto disable and display nothing, anyone knows how to fix this?

What is your setup?
My ZBook 17 G2 has the same issue with regular user in X11, but if I login as root under wayland the external monitor works. I then have to log out of root, switch back to X11 and then login as regular user to get my external monitor to work with my laptop.

jonzn4suse@ZBook-17-G2-Tumbleweed:(pts/1) [12:11pm]> inxi -G -c0
Device-1: Intel 4th Gen Core Processor Integrated Graphics driver: i915
v: kernel
Device-2: NVIDIA GK104GLM [Quadro K3100M] driver: nvidia v: 470.239.06
Device-3: Cheng Uei Precision Industry (Foxlink) HP EliteBook integrated
HD Webcam driver: uvcvideo type: USB
Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.4 driver: X:
loaded: modesetting,nvidia unloaded: fbdev,vesa dri: crocus
gpu: i915,nvidia,nvidia-nvswitch resolution: 1: 2560x1440~60Hz
2: 1920x1080~60Hz
API: EGL v: 1.5 drivers: crocus,nvidia,swrast
platforms: gbm,x11,surfaceless,device
API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: intel mesa v: 23.3.6
renderer: Mesa Intel HD Graphics 4600 (HSW GT2)
API: Vulkan v: 1.3.275 drivers: N/A surfaces: xcb,xlib

You’ll have to provide some more info.

Laptop or desktop?
Graphics card used?
Wayland or X11?
USB-C external screen, HDMI, …
Arch, which kernel in use? Have you tested lts kernel to crosscheck?

Had the same issue on a 2021 Asus A15 TUF (AMD Cpu/Nvidia 3060) and usb-c connected external screen. In my case the solution was installing usb_modeswitch.

Available in Arch extra repo.