Screen lags, reacts to input with delay or doesn't react until another input (like two keypresses)

  • Specs
    Operating System: openSUSE Tumbleweed 20230406
    KDE Plasma Version: 5.27.4
    KDE Frameworks Version: 5.104.0
    Qt Version: 5.15.8
    Kernel Version: 6.2.9-1-default (64-bit)
    Graphics Platform: Wayland
    Processors: 4 × Intel® Xeon® CPU E31220 @ 3.10GHz
    Memory: 9.7 GiB of RAM
    Graphics Processor: NVIDIA GeForce GTX 1050/PCIe/SSE2
    Manufacturer: LENOVO
    Product Name: 3598B44
    System Version: ThinkCentre M72e

The problem: I press a key to enter a character, it doesn’t appear on the screen, but when I press another one, it appears. Or I move the caret with arrows and it react with a 1-2 second delay.

May be related to this issue.

But I suspect it’s more probably related to the fact I’ve messed up my repos a bit some time ago using opi, choosing and saving the lest general ones (e.g., not openSUSE:Factory, but X11:LXQt).

I may also need to completely reinstall qt components, I also suspect. How do I completely remove everything related to qt and install the latest available version (I believe it’s 6)?

One other possible relation: I’m using Wayland and not X11. I had issues like the screen becoming black after login when using Wayland, the zypper dup, IIRC, solved this.

Thanks to anyone who decides to look into this.