System is Fedora KDE, graphics card is an Asrock Radeon 5900GRE, display is a Gigabyte M34WQ (1440p ultrawide 144Hz refresh rate) attached via DisplayPort.
Despite being on a UPS (which…we’re also going to have to talk about) my system was apparently shut down by a thunderstorm. I booted it up, and the display was acting glitchy. I would get two mouse cursors, and below the mouse cursor the screen would go a solid color, as if it was glitching on a pixel and then displaying that from there down.
Switching to a lower refresh rate made the problem go away, I’ve switched back up and it seems to be alright. A second 1080p60 monitor attached via HDMI didn’t show any problem.
Some googling didn’t turn up exactly what I was experiencing. Can anyone help troubleshoot this? It seems okay for the moment but I’m hoping I don’t have a wounded GPU.
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.
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