I’m having the same issue with glitching just after today updating my system via terminal with sudo dnf update. It’s a grey horizontal bar of different sizes flashing on screen - sometimes it even covers the whole screen. Really disturbing. It seems to happen more when the screen is idling, and when I move the mouse or use the keyboard, it tends to go away.
Booting using the previous kernel (6.14.11-300, in my case) makes the glitching go away, so it seems it’s related to 6.15 kernel. I’ll stay with the 6.14 for the moment.
Similar problems for me. Did a DNF upgrade last night, as soon as the system rebooted there were visual glitches in the SDDM login screen, the whole bottom half of the monitor would flicker from the background to a solid color. Similar issues on logging in, graphics will flicker in half-regions of the monitor, the cursor will often split into two.
I have been running into an issue where my second monitor, running off my iGPU (AMD 7950x) will not show a display when my system wakes up. I then try to reboot and the computer freezes, forcing me to hard reboot with the power switch, which fixes the issue until next time my system sleeps.
The main monitor is plugged into my nvidia GPU, and has no issues otherwise. Not sure if the freezing is related to the AMD GPU issue?
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.3-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 7950X 16-Core Processor
Memory: 32 GiB of RAM (30.4 GiB usable)
Graphics Processor 1: NVIDIA GeForce RTX 4070 Ti SUPER
Graphics Processor 2: AMD Radeon Graphics
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: B650 GAMING X AX
I have the exact same problem after upgraded to kernel 6.15, and I tried tinkering some options under System Settings > Display Configuration and found changing the “Color accuracy” option from “Prefer color accuracy” to “Prefer efficiency” completely fix the issue!
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.3-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7800X3D 8-Core Processor
Memory: 16 GiB of RAM (15.2 GiB usable)
Graphics Processor: AMD Radeon RX 7800 XT
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7E24
System Version: 1.0
Very interesting. To clarify, this fixed the issues on the second monitor, or the freezing at reboot, or both? Did you just have to change that setting on only the second monitor’s display configuration or both?
I only have one monitor, and I don’t have the freezing at reboot issue.
I tried changing the Color accuracy option back to “Prefer color accuracy” and the glitching is happen again, so I pretty sure this option is causing the issue (at least for me).
If it helps, my monitor is 2560x1440 @ 180Hz running through DisplayPort.
