+++ This bug was initially created as a clone of Bug #466683 +++ Operating System: Fedora Linux 37 KDE Plasma Version: 5.27.2 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8 Kernel Version: 6.1.14-200.fc37.x86_64 (64-bit) Graphics Platform: Wayland Processors: 8 × Intel® Core™ i7-7820HQ CPU @ 2.90GHz Memory: 31,1 GiB of RAM Graphics Processor: Mesa Intel® HD Graphics 630 Setup: Laptop with 2K Laptop screen and a fullhd screen (1920x1080) connected by displayPort Use fullHD monitor as 'primary' and perform all tests on the fullHD monitor (ignore laptop screen) Go to systemsettings > display config and set 175% scale for 2K laptop screen, 100% for fullhd screen. This makes apps/windows on both monitors the same visual size. Problem: - the mouse scroll-wheel behaviour on browsers 'jumps' when being operated slowly. The impression is that with each slow wheel movement, the browser scrolls up/down 3 or 4 lines at once (giving this jumpy look) Contrast this behaviour to normal 100% scale, where slow scrolling is smooth This is not restriced to browsers, other scrollable lists are affected as well, but this effect typically catches your attention in a long, scrollable website
Can kind of reproduce on Firefox (in native Wayland mode). It's very subtle and difficult to notice though.
I did some further testing and i think this could also be related to the mouse-settings I'm using a logitech M525 mouse and solaar running in the backround. It's using the 'scroll wheel high resolution' option set to enabled. Depending on how you (gently) touch the scrollwheel, this causes jumps when operated slowly and gets smoother the quicker you scroll. Maybe this has nothing to do with plasma/screen renderings And yes, firefox behaves differently as chrome regarding scrolling. I'd say the culprit is the mouse, i am tempted to close this as well...
If you use it on a 4K monitor, this effect can be neglected. On a fullHD screen it's way more noticeable
What is solaar? Can you reproduce the issue with a laptop touchpad or an old fashioned clicky mouse wheel?
https://pwr-solaar.github.io/Solaar/ A logitech device manager (better: a manager for the unifying receiver and its clients)
Any chance you could uninstall it temporarily (your settings won't get erased, so this is safe) and then reboot to see if the issue you're seeing goes away?
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update to scrolling: i uninstalled the mouse-addon (solaar) and also tried tweaking the sensitivity of the scroll wheel settings in systemsettings. The jumpiness remains, but it's much more fine-grained controllable.