Leap 15 logs me out

After the last upgrade, Leap 15 logs me out “randomly” (I’ve noticed that it’s not really randomly, but it seems to happen when I’m changing something in the system settings). I have this problem when running KDE Plasma 5, but it never happens when I’m running xfce4.
My computer is fast enough for Plasma (I believe so, at least; 3.81 GiB RAM, ~2.5 MHz CPU).
The output of lspci -v -s is:

00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])    Subsystem: Hewlett-Packard Company Compaq 500B Microtower
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at fe400000 (64-bit, non-prefetchable) [size=4]
    Memory at d0000000 (64-bit, prefetchable) [size=256]
    I/O ports at dc00 [size=8]
    [virtual] Expansion ROM at 000c0000 [disabled] [size=128]
    Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
    Capabilities: [d0] Power Management version 2
    Capabilities: [a4] PCI Advanced Features
    Kernel driver in use: i915
    Kernel modules: i915


inxi -Gxx would tell us more precisely which GPU you have, as well as which X driver is in use.

Have you looked for clues in .xsession-errors or journalctl?

When trying to reproduce the problem (in order to check if journalctl etc gives any information) I logged into Plasma (not Wayland this time!) and now it seems like I’m not unexpectedly logged out anymore.
inxi -Gxx gives:

**Graphics: ****Card:** Intel 4 Series Integrated Graphics Controller **bus-ID:** 00:02.0 **chip-ID:** 8086:2e32
**Display Server:** x11 (X.org 1.19.6 ) **drivers:** modesetting (unloaded: fbdev,vesa) **tty size:** 118x43           

Maybe my graphic card is not compatible with Wayland?

Yes, that might be a Wayland problem.

I have not run into that problem with Wayland. But Wayland support for Plasma is still poor, so I have been mostly sticking to X11.

8086:2e32 is Eaglelake/G41, 10 year old technology, among the earliest Intel GPUs supported by the modesetting driver you are currently using. Possibly you would get different results from installing the old Intel driver, xf86-video-intel.

Everything is crystal clear now!
For me, the solution is to avoid using Wayland, temporarily.

KDE indeed isn’t there yet re. Wayland, and not at all there re. Wayland + NVIDIA