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So, this bug started happening very recently, all was fine before.

I use a T14G2 AMD as my 'secondary device' alongside my desktop, and have it
set up to have the Ultra dock connect to alternate Inputs of my screen. If I
want to switch from desktop to laptop, I switch the monitor's input, and switch
my USB KVM over to the laptop for mouse/keyboard. This includes one over HDMI,
and one over DisplayPort.

What started happening, is that sometimes, when switching over, specifically
when changing the monitor input, the whole system freezes up and gets
unresponsive; this is only fixed with a hard power down (5s press). It doesn't
always happen immediately, but most often does if the input was switched to
another device for a longer time (>10 minutes). It doesn't matter if the laptop
screen is active or not - the moment I switch the monitor input, the system
locks up - I verified this by leaving the laptop's screen active. Mouse moved,
switch monitor input to output the KDE system, system frozen.

Checking journalctl I get no even remotely relevant messages - the system
itself still appears to be running up to the point of the hang - no journalctl
entries afterwards. Can't switch to terminal only mode (ctrl+alt+F keys)
either, so it's not just KDE that's hanging.

Reproducible: Always

Steps to Reproduce:
1. Start laptop system with external monitors attached
2. Switch away monitor inputs for ~10-15 minutes
3. Switch back to inputs to laptop

Unclear if related to docking station (Thinkpad Ultra
https://support.lenovo.com/us/en/solutions/pd500173-thinkpad-ultra-docking-station-overview-and-service-parts
)
Actual Results:  
System becomes unresponsive

Expected Results:  
System continues working normally