What do these artifacts look like? I've got lines appearing on my AMD laptop with fractional scaling enabled. But I'm pretty sure that my issue will be fixed in Plasma 6.
Edit: Actually for my issue I just increased my VRAM allocation to 4GB and it seems fine.
For Youtube in fullscreen, it's small flashes of magenta pixels when the video controls appear/disappear (or when I move my mouse). For ACC, the screen goes white with moving elements outlined in black pixels until I set the resolution down to 1080p.
I actually get total screen corruption (multiple colours in stripes of corruption) when setting the screen resolution beyond native (eg. forcing wayland to downscale the image to my screen).
I'll check my VRAM allocation, right now I think it's 4GB but the BIOS is kinda limited -- hopefully I can get it to 6 or 8GB since I've got like 24GB of RAM to spare.
Yeah that's not normal, is there anything appearing in dmesg? Probably do dmesg | grep -i amdgpu to filter out the other stuff.
Otherwise maybe try a different desktop environment and create a bug report if it is KDE specific, or create one anyway and someone smarter than me should be able to work it out.
Gonna try Kubuntu for the hell of it, but just partitioned some space for Cinnamon and it doesn't have any of the issues at least in the X11 session (Updated the kernel too since Cinnamon likes to ship 5.15 which just barely works for this iGPU)
The Wayland session is janky af for Cinnamon anyway, but did notice that scrubbing a fullscreen YT video didn't really show any artifacting there. Then again, this could just be because their wayland implementation is very immature since most of the desktop was a blurry mess of jank.
Oooh maybe this is related, since my display is 144hz and turning the screen freq. to 96Hz stops the artifacting on Youtube... https://gitlab.freedesktop.org/drm/amd/-/issues/2967
Oh! Looks like adaptive sync might be the source. Disabled it and the artifacts disappear entirely. Set it to Always and the jank returns. Wahoo!
Gotta try in games to confirm
EDIT: Yup. ACC had less jank. I think VRR must be broken upstream (mentioned in that issue tracker)
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