Horizontal line appeared across the screen

Support Graphics & Display
1

I looked at the screenshot on my phone and couldn’t see the line.
/etc/X11/mhwd.d/ is empty.

Tried this, but the screen got very shaky.

EDIT Oh, and I also booted from a live USB. The line was still there.

Graphics:  Device-1: Intel RocketLake-S GT1 [UHD Graphics 750] vendor: Micro-Star MSI driver: i915 v: kernel bus-ID: 00:02.0 
           chip-ID: 8086:4c8a class-ID: 0300 
           Display: x11 server: X.Org 1.20.13 compositor: kwin_x11 driver: loaded: modesetting alternate: fbdev,vesa 
           display-ID: :0 screens: 1 
           Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") s-diag: 582mm (22.9") 
           OpenGL: renderer: Mesa Intel Graphics (RKL GT1) v: 4.6 Mesa 21.2.2 direct render: Yes 

Desktop: KDE Plasma 5.22.5 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM

How can I ascertain whether I need a new monitor?

2

You already did.

3

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