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I meant switch the power plug for the monitor to a different outlet.
Right now, if I set KDE's settings to 100 Hz, everything looks fine. If I set it to 144 Hz, sometimes I see a double mouse cursor. I get a second cursor about an inch to the right of what seems to be the actual cursor.
Explain how a problem with the UPS will cause that symptom.
That looks like a Wayland issue to me tbh.
When you increase your resolution, your monitor switches power modes. At a higher refresh rate, a dirty power signal can cause artifacts on the screen. Usually this means that you'd see bit crawl on the edges of the screen, but it could show display artifacts like you describe depending on the panel controller.
If your UPS took a hit during a thunderstorm, you could easily have a damaged rectifier in the UPS. That rectifier is responsible for smoothing the power signal coming out the ports on your UPS. A dirty signal can do the above as I mentioned.
You wouldn't notice a problem on your machine because it's own PSU smooths those signals out, but a monitor doesn't have that.
I'm still skeptical that it would cause problems that minor, prior experience tells me it would do something like work fine at low resolution and show no picture or boot loop or something at higher resolution, but for the sake of troubleshooting when there's less convective activity on the radar I'll try plugging it straight into the wall.
It's not bulletproof, but I've seen it live, so it happens. Proof:
https://forums.tomshardware.com/threads/monitor-shows-artifacts-for-a-couple-minutes-then-works-perfectly-fine.3518801/
Okay, it's not the power supply. Found this on the Fedora forums: https://discussion.fedoraproject.org/t/weird-cursor-issues-on-fedora-kde/156413/8
Apparently the power failure just happened to coincide with a kernel update that causes a bug with AMD firmware; people are reporting the issue with higher end Radeon 7000 series cards using high refresh monitors attached via DP with kernel 6.15.
My uname -r output: 6.15.3-200.fc42.x86_64
So I can either learn how to revert to kernel 6.14 on Fedora, I've never messed with it before, or live with 100Hz like a bronze age slum rat until they push a fix.
The further mystery is why a momentary power loss took down a PC plugged into a UPS. It has one job, that it apparently didn't do.