https://bugs.kde.org/show_bug.cgi?id=436136
--- Comment #4 from Duncan <1i5t5.dun...@cox.net> --- It's definitely a bug, tho I believe it's hardware/drivers dependent. I /had/ omitted to try with scaling (as you might have guessed seeing as I didn't mention it) as (to my embarrassment) I somehow missed that in your description. My bad! But I just tried it now, and at least here, scaling works on wayland. =:^) (Set in kde systemsettings, display and monitor, display configuration. I believe kscreen must be installed, however. That kcm's missing if it's not.) And I still didn't get artifacts but performance trying to move the image around was *dramatically* worse/slower, to the point that if that was my otherwise-normal setting I'd definitely be looking for faster alternatives as I'd have trouble working that way. System scaling with gwenview zooming and image-panning is definitely struggling. I wonder if amdgpu is set to continue rendering well in that case, or possibly it's kwin-wayland's or mesa's efforts to keep the "every frame perfect, skip frames if necessary" promise that's wayland's normal defined policy, while either X or your hardware makes the other choice and goes for speed over perfect rendering, with those artifacts you're getting the result? I'm going to have to restart kde/plasma in X mode and test scaling there. If the results match yours there and it's faster with artifacts on my amdgpu/radeon too we're looking at a rather different bug than if the results match my wayland results and it's slower but still correct on X for me. -- You are receiving this mail because: You are watching all bug changes.
