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Strange graphical issue after a power failure (sh.itjust.works)

submitted 1 week ago by [email protected] to c/[email protected]

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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.

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[–] [email protected] 0 points 1 week ago (1 children)

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.

[–] [email protected] 0 points 1 week ago (1 children)

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/

[–] [email protected] 0 points 1 week ago

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.